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1 | /* | ||
2 | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | ||
3 | SLEPc - Scalable Library for Eigenvalue Problem Computations | ||
4 | Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain | ||
5 | |||
6 | This file is part of SLEPc. | ||
7 | SLEPc is distributed under a 2-clause BSD license (see LICENSE). | ||
8 | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | ||
9 | */ | ||
10 | |||
11 | #include <slepc/private/dsimpl.h> | ||
12 | #include <slepcblaslapack.h> | ||
13 | |||
14 | 3528 | static PetscErrorCode DSAllocate_HEP(DS ds,PetscInt ld) | |
15 | { | ||
16 |
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3528 | PetscFunctionBegin; |
17 |
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3528 | if (!ds->compact) PetscCall(DSAllocateMat_Private(ds,DS_MAT_A)); |
18 |
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3528 | PetscCall(DSAllocateMat_Private(ds,DS_MAT_Q)); |
19 |
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3528 | PetscCall(DSAllocateMat_Private(ds,DS_MAT_T)); |
20 |
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3528 | PetscCall(PetscFree(ds->perm)); |
21 |
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3528 | PetscCall(PetscMalloc1(ld,&ds->perm)); |
22 |
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670 | PetscFunctionReturn(PETSC_SUCCESS); |
23 | } | ||
24 | |||
25 | /* 0 l k n-1 | ||
26 | ----------------------------------------- | ||
27 | |* . . | | ||
28 | | * . . | | ||
29 | | * . . | | ||
30 | | * . . | | ||
31 | |. . . . o o | | ||
32 | | o o | | ||
33 | | o o | | ||
34 | | o o | | ||
35 | | o o | | ||
36 | | o o | | ||
37 | |. . . . o o o o o o o x | | ||
38 | | x x x | | ||
39 | | x x x | | ||
40 | | x x x | | ||
41 | | x x x | | ||
42 | | x x x | | ||
43 | | x x x | | ||
44 | | x x x | | ||
45 | | x x x| | ||
46 | | x x| | ||
47 | ----------------------------------------- | ||
48 | */ | ||
49 | |||
50 | 1326 | static PetscErrorCode DSSwitchFormat_HEP(DS ds) | |
51 | { | ||
52 | 1326 | PetscReal *T; | |
53 | 1326 | PetscScalar *A; | |
54 | 1326 | PetscInt i,n=ds->n,k=ds->k,ld=ds->ld; | |
55 | |||
56 |
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1326 | PetscFunctionBegin; |
57 | /* switch from compact (arrow) to dense storage */ | ||
58 |
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1326 | PetscCall(MatDenseGetArrayWrite(ds->omat[DS_MAT_A],&A)); |
59 |
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1326 | PetscCall(DSGetArrayReal(ds,DS_MAT_T,&T)); |
60 |
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1326 | PetscCall(PetscArrayzero(A,ld*ld)); |
61 |
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1326 | for (i=0;i<k;i++) { |
62 | ✗ | A[i+i*ld] = T[i]; | |
63 | ✗ | A[k+i*ld] = T[i+ld]; | |
64 | ✗ | A[i+k*ld] = T[i+ld]; | |
65 | } | ||
66 | 1326 | A[k+k*ld] = T[k]; | |
67 |
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23388 | for (i=k+1;i<n;i++) { |
68 | 22062 | A[i+i*ld] = T[i]; | |
69 | 22062 | A[i-1+i*ld] = T[i-1+ld]; | |
70 | 22062 | A[i+(i-1)*ld] = T[i-1+ld]; | |
71 | } | ||
72 |
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1326 | if (ds->extrarow) A[n+(n-1)*ld] = T[n-1+ld]; |
73 |
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1326 | PetscCall(MatDenseRestoreArrayWrite(ds->omat[DS_MAT_A],&A)); |
74 |
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1326 | PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&T)); |
75 |
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236 | PetscFunctionReturn(PETSC_SUCCESS); |
76 | } | ||
77 | |||
78 | 208 | static PetscErrorCode DSView_HEP(DS ds,PetscViewer viewer) | |
79 | { | ||
80 | 208 | PetscViewerFormat format; | |
81 | 208 | PetscInt i,j,r,c,rows; | |
82 | 208 | PetscReal *T,value; | |
83 | 208 | const char *methodname[] = { | |
84 | "Implicit QR method (_steqr)", | ||
85 | "Relatively Robust Representations (_stevr)", | ||
86 | "Divide and Conquer method (_stedc)", | ||
87 | "Block Divide and Conquer method (dsbtdc)" | ||
88 | }; | ||
89 | 208 | const int nmeth=PETSC_STATIC_ARRAY_LENGTH(methodname); | |
90 | |||
91 |
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208 | PetscFunctionBegin; |
92 |
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208 | PetscCall(PetscViewerGetFormat(viewer,&format)); |
93 |
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208 | if (format == PETSC_VIEWER_ASCII_INFO || format == PETSC_VIEWER_ASCII_INFO_DETAIL) { |
94 |
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148 | if (ds->bs>1) PetscCall(PetscViewerASCIIPrintf(viewer,"block size: %" PetscInt_FMT "\n",ds->bs)); |
95 |
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148 | if (ds->method<nmeth) PetscCall(PetscViewerASCIIPrintf(viewer,"solving the problem with: %s\n",methodname[ds->method])); |
96 |
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148 | PetscFunctionReturn(PETSC_SUCCESS); |
97 | } | ||
98 |
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60 | if (ds->compact) { |
99 |
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60 | PetscCall(DSGetArrayReal(ds,DS_MAT_T,&T)); |
100 |
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60 | PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_FALSE)); |
101 |
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60 | rows = ds->extrarow? ds->n+1: ds->n; |
102 |
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60 | if (format == PETSC_VIEWER_ASCII_MATLAB) { |
103 |
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60 | PetscCall(PetscViewerASCIIPrintf(viewer,"%% Size = %" PetscInt_FMT " %" PetscInt_FMT "\n",rows,ds->n)); |
104 |
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60 | PetscCall(PetscViewerASCIIPrintf(viewer,"zzz = zeros(%" PetscInt_FMT ",3);\n",3*ds->n)); |
105 |
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60 | PetscCall(PetscViewerASCIIPrintf(viewer,"zzz = [\n")); |
106 |
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600 | for (i=0;i<ds->n;i++) PetscCall(PetscViewerASCIIPrintf(viewer,"%" PetscInt_FMT " %" PetscInt_FMT " %18.16e\n",i+1,i+1,(double)T[i])); |
107 |
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570 | for (i=0;i<rows-1;i++) { |
108 |
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510 | r = PetscMax(i+2,ds->k+1); |
109 | 510 | c = i+1; | |
110 |
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510 | PetscCall(PetscViewerASCIIPrintf(viewer,"%" PetscInt_FMT " %" PetscInt_FMT " %18.16e\n",r,c,(double)T[i+ds->ld])); |
111 |
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510 | if (i<ds->n-1 && ds->k<ds->n) { /* do not print vertical arrow when k=n */ |
112 |
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480 | PetscCall(PetscViewerASCIIPrintf(viewer,"%" PetscInt_FMT " %" PetscInt_FMT " %18.16e\n",c,r,(double)T[i+ds->ld])); |
113 | } | ||
114 | } | ||
115 |
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60 | PetscCall(PetscViewerASCIIPrintf(viewer,"];\n%s = spconvert(zzz);\n",DSMatName[DS_MAT_T])); |
116 | } else { | ||
117 | ✗ | for (i=0;i<rows;i++) { | |
118 | ✗ | for (j=0;j<ds->n;j++) { | |
119 | ✗ | if (i==j) value = T[i]; | |
120 | ✗ | else if ((i<ds->k && j==ds->k) || (i==ds->k && j<ds->k)) value = T[PetscMin(i,j)+ds->ld]; | |
121 | ✗ | else if (i==j+1 && i>ds->k) value = T[i-1+ds->ld]; | |
122 | ✗ | else if (i+1==j && j>ds->k) value = T[j-1+ds->ld]; | |
123 | else value = 0.0; | ||
124 | ✗ | PetscCall(PetscViewerASCIIPrintf(viewer," %18.16e ",(double)value)); | |
125 | } | ||
126 | ✗ | PetscCall(PetscViewerASCIIPrintf(viewer,"\n")); | |
127 | } | ||
128 | } | ||
129 |
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60 | PetscCall(PetscViewerASCIIUseTabs(viewer,PETSC_TRUE)); |
130 |
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60 | PetscCall(PetscViewerFlush(viewer)); |
131 |
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60 | PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&T)); |
132 | ✗ | } else PetscCall(DSViewMat(ds,viewer,DS_MAT_A)); | |
133 |
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60 | if (ds->state>DS_STATE_INTERMEDIATE) PetscCall(DSViewMat(ds,viewer,DS_MAT_Q)); |
134 |
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12 | PetscFunctionReturn(PETSC_SUCCESS); |
135 | } | ||
136 | |||
137 | 242399 | static PetscErrorCode DSVectors_HEP(DS ds,DSMatType mat,PetscInt *j,PetscReal *rnorm) | |
138 | { | ||
139 | 242399 | PetscScalar *Z; | |
140 | 242399 | const PetscScalar *Q; | |
141 | 242399 | PetscInt ld = ds->ld; | |
142 | |||
143 |
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242399 | PetscFunctionBegin; |
144 |
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242399 | switch (mat) { |
145 | 242399 | case DS_MAT_X: | |
146 | case DS_MAT_Y: | ||
147 |
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242399 | if (j) { |
148 |
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241787 | PetscCall(MatDenseGetArray(ds->omat[mat],&Z)); |
149 |
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241787 | if (ds->state>=DS_STATE_CONDENSED) { |
150 |
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241787 | PetscCall(MatDenseGetArrayRead(ds->omat[DS_MAT_Q],&Q)); |
151 |
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241787 | PetscCall(PetscArraycpy(Z+(*j)*ld,Q+(*j)*ld,ld)); |
152 |
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241787 | if (rnorm) *rnorm = PetscAbsScalar(Q[ds->n-1+(*j)*ld]); |
153 |
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241787 | PetscCall(MatDenseRestoreArrayRead(ds->omat[DS_MAT_Q],&Q)); |
154 | } else { | ||
155 | ✗ | PetscCall(PetscArrayzero(Z+(*j)*ld,ld)); | |
156 | ✗ | Z[(*j)+(*j)*ld] = 1.0; | |
157 | ✗ | if (rnorm) *rnorm = 0.0; | |
158 | } | ||
159 |
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241787 | PetscCall(MatDenseRestoreArray(ds->omat[mat],&Z)); |
160 | } else { | ||
161 |
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612 | if (ds->state>=DS_STATE_CONDENSED) PetscCall(MatCopy(ds->omat[DS_MAT_Q],ds->omat[mat],SAME_NONZERO_PATTERN)); |
162 | ✗ | else PetscCall(DSSetIdentity(ds,mat)); | |
163 | } | ||
164 | 46901 | break; | |
165 | ✗ | case DS_MAT_U: | |
166 | case DS_MAT_V: | ||
167 | ✗ | SETERRQ(PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"Not implemented yet"); | |
168 | ✗ | default: | |
169 | ✗ | SETERRQ(PetscObjectComm((PetscObject)ds),PETSC_ERR_ARG_OUTOFRANGE,"Invalid mat parameter"); | |
170 | } | ||
171 |
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46901 | PetscFunctionReturn(PETSC_SUCCESS); |
172 | } | ||
173 | |||
174 | /* | ||
175 | ARROWTRIDIAG reduces a symmetric arrowhead matrix of the form | ||
176 | |||
177 | [ d 0 0 0 e ] | ||
178 | [ 0 d 0 0 e ] | ||
179 | A = [ 0 0 d 0 e ] | ||
180 | [ 0 0 0 d e ] | ||
181 | [ e e e e d ] | ||
182 | |||
183 | to tridiagonal form | ||
184 | |||
185 | [ d e 0 0 0 ] | ||
186 | [ e d e 0 0 ] | ||
187 | T = Q'*A*Q = [ 0 e d e 0 ], | ||
188 | [ 0 0 e d e ] | ||
189 | [ 0 0 0 e d ] | ||
190 | |||
191 | where Q is an orthogonal matrix. Rutishauser's algorithm is used to | ||
192 | perform the reduction, which requires O(n**2) flops. The accumulation | ||
193 | of the orthogonal factor Q, however, requires O(n**3) flops. | ||
194 | |||
195 | Arguments | ||
196 | ========= | ||
197 | |||
198 | N (input) INTEGER | ||
199 | The order of the matrix A. N >= 0. | ||
200 | |||
201 | D (input/output) DOUBLE PRECISION array, dimension (N) | ||
202 | On entry, the diagonal entries of the matrix A to be | ||
203 | reduced. | ||
204 | On exit, the diagonal entries of the reduced matrix T. | ||
205 | |||
206 | E (input/output) DOUBLE PRECISION array, dimension (N-1) | ||
207 | On entry, the off-diagonal entries of the matrix A to be | ||
208 | reduced. | ||
209 | On exit, the subdiagonal entries of the reduced matrix T. | ||
210 | |||
211 | Q (input/output) DOUBLE PRECISION array, dimension (LDQ, N) | ||
212 | On exit, the orthogonal matrix Q. | ||
213 | |||
214 | LDQ (input) INTEGER | ||
215 | The leading dimension of the array Q. | ||
216 | |||
217 | Note | ||
218 | ==== | ||
219 | Based on Fortran code contributed by Daniel Kressner | ||
220 | */ | ||
221 | 25080 | PetscErrorCode DSArrowTridiag(PetscBLASInt n,PetscReal *d,PetscReal *e,PetscScalar *Q,PetscBLASInt ld) | |
222 | { | ||
223 | 25080 | PetscBLASInt i,j,j2,one=1; | |
224 | 25080 | PetscReal c,s,p,off,temp; | |
225 | |||
226 |
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25080 | PetscFunctionBegin; |
227 |
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25080 | if (n<=2) PetscFunctionReturn(PETSC_SUCCESS); |
228 | |||
229 |
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196591 | for (j=0;j<n-2;j++) { |
230 | |||
231 | /* Eliminate entry e(j) by a rotation in the planes (j,j+1) */ | ||
232 | 171640 | temp = e[j+1]; | |
233 |
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171640 | PetscCallBLAS("LAPACKlartg",LAPACKREALlartg_(&temp,&e[j],&c,&s,&e[j+1])); |
234 | 171640 | s = -s; | |
235 | |||
236 | /* Apply rotation to diagonal elements */ | ||
237 | 171640 | temp = d[j+1]; | |
238 | 171640 | e[j] = c*s*(temp-d[j]); | |
239 | 171640 | d[j+1] = s*s*d[j] + c*c*temp; | |
240 | 171640 | d[j] = c*c*d[j] + s*s*temp; | |
241 | |||
242 | /* Apply rotation to Q */ | ||
243 | 171640 | j2 = j+2; | |
244 |
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171640 | PetscCallBLAS("BLASrot",BLASMIXEDrot_(&j2,Q+j*ld,&one,Q+(j+1)*ld,&one,&c,&s)); |
245 | |||
246 | /* Chase newly introduced off-diagonal entry to the top left corner */ | ||
247 |
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1074978 | for (i=j-1;i>=0;i--) { |
248 | 903338 | off = -s*e[i]; | |
249 | 903338 | e[i] = c*e[i]; | |
250 | 903338 | temp = e[i+1]; | |
251 |
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903338 | PetscCallBLAS("LAPACKlartg",LAPACKREALlartg_(&temp,&off,&c,&s,&e[i+1])); |
252 | 903338 | s = -s; | |
253 | 903338 | temp = (d[i]-d[i+1])*s - 2.0*c*e[i]; | |
254 | 903338 | p = s*temp; | |
255 | 903338 | d[i+1] += p; | |
256 | 903338 | d[i] -= p; | |
257 | 903338 | e[i] = -e[i] - c*temp; | |
258 |
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903338 | PetscCallBLAS("BLASrot",BLASMIXEDrot_(&j2,Q+i*ld,&one,Q+(i+1)*ld,&one,&c,&s)); |
259 | } | ||
260 | } | ||
261 |
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4875 | PetscFunctionReturn(PETSC_SUCCESS); |
262 | } | ||
263 | |||
264 | /* | ||
265 | Reduce to tridiagonal form by means of DSArrowTridiag. | ||
266 | */ | ||
267 | 105845 | static PetscErrorCode DSIntermediate_HEP(DS ds) | |
268 | { | ||
269 | 105845 | PetscInt i; | |
270 | 105845 | PetscBLASInt n1 = 0,n2,lwork,info,l = 0,n = 0,ld,off; | |
271 | 105845 | PetscScalar *Q,*work,*tau; | |
272 | 105845 | const PetscScalar *A; | |
273 | 105845 | PetscReal *d,*e; | |
274 | 105845 | Mat At,Qt; /* trailing submatrices */ | |
275 | |||
276 |
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105845 | PetscFunctionBegin; |
277 |
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105845 | PetscCall(PetscBLASIntCast(ds->n,&n)); |
278 |
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105845 | PetscCall(PetscBLASIntCast(ds->l,&l)); |
279 |
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105845 | PetscCall(PetscBLASIntCast(ds->ld,&ld)); |
280 |
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105845 | PetscCall(PetscBLASIntCast(PetscMax(0,ds->k-l+1),&n1)); /* size of leading block, excl. locked */ |
281 | 105845 | n2 = n-l; /* n2 = n1 + size of trailing block */ | |
282 | 105845 | off = l+l*ld; | |
283 |
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105845 | PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d)); |
284 | 105845 | e = d+ld; | |
285 |
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105845 | PetscCall(DSSetIdentity(ds,DS_MAT_Q)); |
286 |
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105845 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q)); |
287 | |||
288 |
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105845 | if (ds->compact) { |
289 | |||
290 |
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34633 | if (ds->state<DS_STATE_INTERMEDIATE) PetscCall(DSArrowTridiag(n1,d+l,e+l,Q+off,ld)); |
291 | |||
292 | } else { | ||
293 | |||
294 |
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71212 | PetscCall(MatDenseGetArrayRead(ds->omat[DS_MAT_A],&A)); |
295 |
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73173 | for (i=0;i<l;i++) { d[i] = PetscRealPart(A[i+i*ld]); e[i] = 0.0; } |
296 | |||
297 |
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71212 | if (ds->state<DS_STATE_INTERMEDIATE) { |
298 |
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71212 | PetscCall(MatDenseGetSubMatrix(ds->omat[DS_MAT_A],ds->l,ds->n,ds->l,ds->n,&At)); |
299 |
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71212 | PetscCall(MatDenseGetSubMatrix(ds->omat[DS_MAT_Q],ds->l,ds->n,ds->l,ds->n,&Qt)); |
300 |
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71212 | PetscCall(MatCopy(At,Qt,SAME_NONZERO_PATTERN)); |
301 |
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71212 | PetscCall(MatDenseRestoreSubMatrix(ds->omat[DS_MAT_A],&At)); |
302 |
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71212 | PetscCall(MatDenseRestoreSubMatrix(ds->omat[DS_MAT_Q],&Qt)); |
303 |
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71212 | PetscCall(DSAllocateWork_Private(ds,ld+ld*ld,0,0)); |
304 | 71212 | tau = ds->work; | |
305 | 71212 | work = ds->work+ld; | |
306 | 71212 | lwork = ld*ld; | |
307 |
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71212 | PetscCallBLAS("LAPACKsytrd",LAPACKsytrd_("L",&n2,Q+off,&ld,d+l,e+l,tau,work,&lwork,&info)); |
308 |
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71212 | SlepcCheckLapackInfo("sytrd",info); |
309 |
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71212 | PetscCallBLAS("LAPACKorgtr",LAPACKorgtr_("L",&n2,Q+off,&ld,tau,work,&lwork,&info)); |
310 |
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71212 | SlepcCheckLapackInfo("orgtr",info); |
311 | } else { | ||
312 | /* copy tridiagonal to d,e */ | ||
313 | ✗ | for (i=l;i<n;i++) d[i] = PetscRealPart(A[i+i*ld]); | |
314 | ✗ | for (i=l;i<n-1;i++) e[i] = PetscRealPart(A[(i+1)+i*ld]); | |
315 | } | ||
316 |
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71212 | PetscCall(MatDenseRestoreArrayRead(ds->omat[DS_MAT_A],&A)); |
317 | } | ||
318 |
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105845 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q)); |
319 |
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105845 | PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d)); |
320 |
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20431 | PetscFunctionReturn(PETSC_SUCCESS); |
321 | } | ||
322 | |||
323 | 173014 | static PetscErrorCode DSSort_HEP(DS ds,PetscScalar *wr,PetscScalar *wi,PetscScalar *rr,PetscScalar *ri,PetscInt *k) | |
324 | { | ||
325 | 173014 | PetscInt n,l,i,*perm,ld=ds->ld; | |
326 | 173014 | PetscScalar *A; | |
327 | 173014 | PetscReal *d; | |
328 | |||
329 |
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173014 | PetscFunctionBegin; |
330 |
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173014 | if (!ds->sc) PetscFunctionReturn(PETSC_SUCCESS); |
331 | 173014 | n = ds->n; | |
332 | 173014 | l = ds->l; | |
333 |
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173014 | PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d)); |
334 | 173014 | perm = ds->perm; | |
335 |
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173014 | if (!rr) PetscCall(DSSortEigenvaluesReal_Private(ds,d,perm)); |
336 |
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136006 | else PetscCall(DSSortEigenvalues_Private(ds,rr,ri,perm,PETSC_FALSE)); |
337 |
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2296206 | for (i=l;i<n;i++) wr[i] = d[perm[i]]; |
338 |
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173014 | PetscCall(DSPermuteColumns_Private(ds,l,n,n,DS_MAT_Q,perm)); |
339 |
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2296206 | for (i=l;i<n;i++) d[i] = PetscRealPart(wr[i]); |
340 |
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173014 | if (!ds->compact) { |
341 |
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138381 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
342 |
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1718866 | for (i=l;i<n;i++) A[i+i*ld] = wr[i]; |
343 |
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138381 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
344 | } | ||
345 |
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173014 | PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d)); |
346 |
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33341 | PetscFunctionReturn(PETSC_SUCCESS); |
347 | } | ||
348 | |||
349 | 24466 | static PetscErrorCode DSUpdateExtraRow_HEP(DS ds) | |
350 | { | ||
351 | 24466 | PetscInt i; | |
352 | 24466 | PetscBLASInt n,ld,incx=1; | |
353 | 24466 | PetscScalar *A,*x,*y,one=1.0,zero=0.0; | |
354 | 24466 | PetscReal *T,*e,beta; | |
355 | 24466 | const PetscScalar *Q; | |
356 | |||
357 |
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24466 | PetscFunctionBegin; |
358 |
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24466 | PetscCall(PetscBLASIntCast(ds->n,&n)); |
359 |
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24466 | PetscCall(PetscBLASIntCast(ds->ld,&ld)); |
360 |
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24466 | PetscCall(MatDenseGetArrayRead(ds->omat[DS_MAT_Q],&Q)); |
361 |
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24466 | if (ds->compact) { |
362 |
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24436 | PetscCall(DSGetArrayReal(ds,DS_MAT_T,&T)); |
363 | 24436 | e = T+ld; | |
364 | 24436 | beta = e[n-1]; /* in compact, we assume all entries are zero except the last one */ | |
365 |
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447585 | for (i=0;i<n;i++) e[i] = PetscRealPart(beta*Q[n-1+i*ld]); |
366 |
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24436 | PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&T)); |
367 | 24436 | ds->k = n; | |
368 | } else { | ||
369 |
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30 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
370 |
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30 | PetscCall(DSAllocateWork_Private(ds,2*ld,0,0)); |
371 | 30 | x = ds->work; | |
372 | 30 | y = ds->work+ld; | |
373 |
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390 | for (i=0;i<n;i++) x[i] = PetscConj(A[n+i*ld]); |
374 |
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30 | PetscCallBLAS("BLASgemv",BLASgemv_("C",&n,&n,&one,Q,&ld,x,&incx,&zero,y,&incx)); |
375 |
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390 | for (i=0;i<n;i++) A[n+i*ld] = PetscConj(y[i]); |
376 | 30 | ds->k = n; | |
377 |
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30 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
378 | } | ||
379 |
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24466 | PetscCall(MatDenseRestoreArrayRead(ds->omat[DS_MAT_Q],&Q)); |
380 |
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4744 | PetscFunctionReturn(PETSC_SUCCESS); |
381 | } | ||
382 | |||
383 | 105765 | static PetscErrorCode DSSolve_HEP_QR(DS ds,PetscScalar *wr,PetscScalar *wi) | |
384 | { | ||
385 | 105765 | PetscInt i; | |
386 | 105765 | PetscBLASInt n1,info,l = 0,n = 0,ld,off; | |
387 | 105765 | PetscScalar *Q,*A; | |
388 | 105765 | PetscReal *d,*e; | |
389 | |||
390 |
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105765 | PetscFunctionBegin; |
391 |
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105765 | PetscCheck(ds->bs==1,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"This method is not prepared for bs>1"); |
392 |
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105765 | PetscCall(PetscBLASIntCast(ds->n,&n)); |
393 |
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105765 | PetscCall(PetscBLASIntCast(ds->l,&l)); |
394 |
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105765 | PetscCall(PetscBLASIntCast(ds->ld,&ld)); |
395 | 105765 | n1 = n-l; /* n1 = size of leading block, excl. locked + size of trailing block */ | |
396 | 105765 | off = l+l*ld; | |
397 |
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105765 | PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d)); |
398 | 105765 | e = d+ld; | |
399 | |||
400 | /* Reduce to tridiagonal form */ | ||
401 |
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105765 | PetscCall(DSIntermediate_HEP(ds)); |
402 | |||
403 | /* Solve the tridiagonal eigenproblem */ | ||
404 |
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188198 | for (i=0;i<l;i++) wr[i] = d[i]; |
405 | |||
406 |
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105765 | PetscCall(DSAllocateWork_Private(ds,0,2*ld,0)); |
407 |
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105765 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q)); |
408 |
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105765 | PetscCallBLAS("LAPACKsteqr",LAPACKsteqr_("V",&n1,d+l,e+l,Q+off,&ld,ds->rwork,&info)); |
409 |
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105765 | SlepcCheckLapackInfo("steqr",info); |
410 |
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105765 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q)); |
411 |
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1476822 | for (i=l;i<n;i++) wr[i] = d[i]; |
412 | |||
413 | /* Create diagonal matrix as a result */ | ||
414 |
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105765 | if (ds->compact) PetscCall(PetscArrayzero(e,n-1)); |
415 | else { | ||
416 |
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71172 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
417 |
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899802 | for (i=l;i<n;i++) PetscCall(PetscArrayzero(A+l+i*ld,n-l)); |
418 |
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899802 | for (i=l;i<n;i++) A[i+i*ld] = d[i]; |
419 |
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71172 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
420 | } | ||
421 |
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105765 | PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d)); |
422 | |||
423 | /* Set zero wi */ | ||
424 |
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1303086 | if (wi) for (i=l;i<n;i++) wi[i] = 0.0; |
425 |
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20415 | PetscFunctionReturn(PETSC_SUCCESS); |
426 | } | ||
427 | |||
428 | 40 | static PetscErrorCode DSSolve_HEP_MRRR(DS ds,PetscScalar *wr,PetscScalar *wi) | |
429 | { | ||
430 | 40 | Mat At,Qt; /* trailing submatrices */ | |
431 | 40 | PetscInt i; | |
432 | 40 | PetscBLASInt n1 = 0,n2 = 0,n3,lrwork,liwork,info,l = 0,n = 0,m = 0,ld,off,il,iu,*isuppz; | |
433 | 40 | PetscScalar *A,*Q,*W=NULL,one=1.0,zero=0.0; | |
434 | 40 | PetscReal *d,*e,abstol=0.0,vl,vu; | |
435 | #if defined(PETSC_USE_COMPLEX) | ||
436 | 20 | PetscInt j; | |
437 | 20 | PetscReal *Qr,*ritz; | |
438 | #endif | ||
439 | |||
440 |
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40 | PetscFunctionBegin; |
441 |
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40 | PetscCheck(ds->bs==1,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"This method is not prepared for bs>1"); |
442 |
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40 | PetscCall(PetscBLASIntCast(ds->n,&n)); |
443 |
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40 | PetscCall(PetscBLASIntCast(ds->l,&l)); |
444 |
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40 | PetscCall(PetscBLASIntCast(ds->ld,&ld)); |
445 |
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40 | PetscCall(PetscBLASIntCast(ds->k-l+1,&n1)); /* size of leading block, excl. locked */ |
446 |
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40 | PetscCall(PetscBLASIntCast(n-ds->k-1,&n2)); /* size of trailing block */ |
447 | 40 | n3 = n1+n2; | |
448 | 40 | off = l+l*ld; | |
449 |
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40 | PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d)); |
450 | 40 | e = d+ld; | |
451 | |||
452 | /* Reduce to tridiagonal form */ | ||
453 |
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40 | PetscCall(DSIntermediate_HEP(ds)); |
454 | |||
455 | /* Solve the tridiagonal eigenproblem */ | ||
456 |
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80 | for (i=0;i<l;i++) wr[i] = d[i]; |
457 | |||
458 |
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40 | if (ds->state<DS_STATE_INTERMEDIATE) { /* Q contains useful info */ |
459 |
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40 | PetscCall(DSAllocateMat_Private(ds,DS_MAT_W)); |
460 |
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40 | PetscCall(MatCopy(ds->omat[DS_MAT_Q],ds->omat[DS_MAT_W],SAME_NONZERO_PATTERN)); |
461 | } | ||
462 |
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40 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q)); |
463 | 40 | lrwork = 20*ld; | |
464 | 40 | liwork = 10*ld; | |
465 | #if defined(PETSC_USE_COMPLEX) | ||
466 |
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20 | PetscCall(DSAllocateWork_Private(ds,0,lrwork+ld+ld*ld,liwork+2*ld)); |
467 | #else | ||
468 |
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20 | PetscCall(DSAllocateWork_Private(ds,0,lrwork+ld,liwork+2*ld)); |
469 | #endif | ||
470 | 40 | isuppz = ds->iwork+liwork; | |
471 | #if defined(PETSC_USE_COMPLEX) | ||
472 | 20 | ritz = ds->rwork+lrwork; | |
473 | 20 | Qr = ds->rwork+lrwork+ld; | |
474 |
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20 | PetscCallBLAS("LAPACKstevr",LAPACKstevr_("V","A",&n3,d+l,e+l,&vl,&vu,&il,&iu,&abstol,&m,ritz+l,Qr+off,&ld,isuppz,ds->rwork,&lrwork,ds->iwork,&liwork,&info)); |
475 |
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210 | for (i=l;i<n;i++) wr[i] = ritz[i]; |
476 | #else | ||
477 |
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20 | PetscCallBLAS("LAPACKstevr",LAPACKstevr_("V","A",&n3,d+l,e+l,&vl,&vu,&il,&iu,&abstol,&m,wr+l,Q+off,&ld,isuppz,ds->rwork,&lrwork,ds->iwork,&liwork,&info)); |
478 | #endif | ||
479 |
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40 | SlepcCheckLapackInfo("stevr",info); |
480 | #if defined(PETSC_USE_COMPLEX) | ||
481 |
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210 | for (i=l;i<n;i++) |
482 |
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2120 | for (j=l;j<n;j++) |
483 | 1930 | Q[i+j*ld] = Qr[i+j*ld]; | |
484 | #endif | ||
485 |
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40 | if (ds->state<DS_STATE_INTERMEDIATE) { /* accumulate previous Q */ |
486 |
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40 | if (ds->compact) PetscCall(DSAllocateMat_Private(ds,DS_MAT_A)); |
487 |
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40 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
488 |
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40 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_W],&W)); |
489 |
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40 | PetscCallBLAS("BLASgemm",BLASgemm_("N","N",&n3,&n3,&n3,&one,W+off,&ld,Q+off,&ld,&zero,A+off,&ld)); |
490 |
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40 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
491 |
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40 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_W],&W)); |
492 |
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40 | PetscCall(MatDenseGetSubMatrix(ds->omat[DS_MAT_A],ds->l,ds->n,ds->l,ds->n,&At)); |
493 |
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40 | PetscCall(MatDenseGetSubMatrix(ds->omat[DS_MAT_Q],ds->l,ds->n,ds->l,ds->n,&Qt)); |
494 |
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40 | PetscCall(MatCopy(At,Qt,SAME_NONZERO_PATTERN)); |
495 |
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40 | PetscCall(MatDenseRestoreSubMatrix(ds->omat[DS_MAT_A],&At)); |
496 |
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40 | PetscCall(MatDenseRestoreSubMatrix(ds->omat[DS_MAT_Q],&Qt)); |
497 | } | ||
498 |
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40 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q)); |
499 |
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420 | for (i=l;i<n;i++) d[i] = PetscRealPart(wr[i]); |
500 | |||
501 | /* Create diagonal matrix as a result */ | ||
502 |
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40 | if (ds->compact) PetscCall(PetscArrayzero(e,n-1)); |
503 | else { | ||
504 |
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20 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
505 |
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260 | for (i=l;i<n;i++) PetscCall(PetscArrayzero(A+l+i*ld,n-l)); |
506 |
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260 | for (i=l;i<n;i++) A[i+i*ld] = d[i]; |
507 |
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20 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
508 | } | ||
509 |
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40 | PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d)); |
510 | |||
511 | /* Set zero wi */ | ||
512 |
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40 | if (wi) for (i=l;i<n;i++) wi[i] = 0.0; |
513 |
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8 | PetscFunctionReturn(PETSC_SUCCESS); |
514 | } | ||
515 | |||
516 | 40 | static PetscErrorCode DSSolve_HEP_DC(DS ds,PetscScalar *wr,PetscScalar *wi) | |
517 | { | ||
518 | 40 | PetscInt i; | |
519 | 40 | PetscBLASInt n1,info,l = 0,ld,off,lrwork,liwork; | |
520 | 40 | PetscScalar *Q,*A; | |
521 | 40 | PetscReal *d,*e; | |
522 | #if defined(PETSC_USE_COMPLEX) | ||
523 | 20 | PetscBLASInt lwork; | |
524 | 20 | PetscInt j; | |
525 | #endif | ||
526 | |||
527 |
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40 | PetscFunctionBegin; |
528 |
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40 | PetscCheck(ds->bs==1,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"This method is not prepared for bs>1"); |
529 |
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40 | PetscCall(PetscBLASIntCast(ds->l,&l)); |
530 |
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40 | PetscCall(PetscBLASIntCast(ds->ld,&ld)); |
531 |
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40 | PetscCall(PetscBLASIntCast(ds->n-ds->l,&n1)); |
532 | 40 | off = l+l*ld; | |
533 |
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40 | PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d)); |
534 | 40 | e = d+ld; | |
535 | |||
536 | /* Reduce to tridiagonal form */ | ||
537 |
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40 | PetscCall(DSIntermediate_HEP(ds)); |
538 | |||
539 | /* Solve the tridiagonal eigenproblem */ | ||
540 |
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80 | for (i=0;i<l;i++) wr[i] = d[i]; |
541 | |||
542 | 40 | lrwork = 5*n1*n1+3*n1+1; | |
543 | 40 | liwork = 5*n1*n1+6*n1+6; | |
544 |
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40 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q)); |
545 | #if !defined(PETSC_USE_COMPLEX) | ||
546 |
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20 | PetscCall(DSAllocateWork_Private(ds,0,lrwork,liwork)); |
547 |
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20 | PetscCallBLAS("LAPACKstedc",LAPACKstedc_("V",&n1,d+l,e+l,Q+off,&ld,ds->rwork,&lrwork,ds->iwork,&liwork,&info)); |
548 | #else | ||
549 | 20 | lwork = ld*ld; | |
550 |
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20 | PetscCall(DSAllocateWork_Private(ds,lwork,lrwork,liwork)); |
551 |
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20 | PetscCallBLAS("LAPACKstedc",LAPACKstedc_("V",&n1,d+l,e+l,Q+off,&ld,ds->work,&lwork,ds->rwork,&lrwork,ds->iwork,&liwork,&info)); |
552 | /* Fixing Lapack bug*/ | ||
553 |
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210 | for (j=ds->l;j<ds->n;j++) |
554 |
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330 | for (i=0;i<ds->l;i++) Q[i+j*ld] = 0.0; |
555 | #endif | ||
556 |
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40 | SlepcCheckLapackInfo("stedc",info); |
557 |
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40 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q)); |
558 |
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420 | for (i=l;i<ds->n;i++) wr[i] = d[i]; |
559 | |||
560 | /* Create diagonal matrix as a result */ | ||
561 |
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40 | if (ds->compact) PetscCall(PetscArrayzero(e,ds->n-1)); |
562 | else { | ||
563 |
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20 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
564 |
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260 | for (i=l;i<ds->n;i++) PetscCall(PetscArrayzero(A+l+i*ld,ds->n-l)); |
565 |
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260 | for (i=l;i<ds->n;i++) A[i+i*ld] = d[i]; |
566 |
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20 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
567 | } | ||
568 |
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40 | PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d)); |
569 | |||
570 | /* Set zero wi */ | ||
571 |
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40 | if (wi) for (i=l;i<ds->n;i++) wi[i] = 0.0; |
572 |
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8 | PetscFunctionReturn(PETSC_SUCCESS); |
573 | } | ||
574 | |||
575 | #if !defined(PETSC_USE_COMPLEX) | ||
576 | 10 | static PetscErrorCode DSSolve_HEP_BDC(DS ds,PetscScalar *wr,PetscScalar *wi) | |
577 | { | ||
578 | 10 | PetscBLASInt i,j,k,m,n = 0,info,nblks,bs = 0,ld = 0,lde,lrwork,liwork,*ksizes,*iwork,mingapi; | |
579 | 10 | PetscScalar *Q,*A; | |
580 | 10 | PetscReal *D,*E,*d,*e,tol=PETSC_MACHINE_EPSILON/2,tau1=1e-16,tau2=1e-18,*rwork,mingap; | |
581 | |||
582 |
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10 | PetscFunctionBegin; |
583 |
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10 | PetscCheck(ds->l==0,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"This method is not prepared for l>1"); |
584 |
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10 | PetscCheck(!ds->compact,PetscObjectComm((PetscObject)ds),PETSC_ERR_SUP,"Not implemented for compact storage"); |
585 |
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10 | PetscCall(PetscBLASIntCast(ds->ld,&ld)); |
586 |
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10 | PetscCall(PetscBLASIntCast(ds->bs,&bs)); |
587 |
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10 | PetscCall(PetscBLASIntCast(ds->n,&n)); |
588 | 10 | nblks = n/bs; | |
589 |
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10 | PetscCall(DSGetArrayReal(ds,DS_MAT_T,&d)); |
590 | 10 | e = d+ld; | |
591 | 10 | lrwork = 4*n*n+60*n+1; | |
592 | 10 | liwork = 5*n+5*nblks-1; | |
593 | 10 | lde = 2*bs+1; | |
594 |
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10 | PetscCall(DSAllocateWork_Private(ds,bs*n+lde*lde*(nblks-1),lrwork,nblks+liwork)); |
595 | 10 | D = ds->work; | |
596 | 10 | E = ds->work+bs*n; | |
597 | 10 | rwork = ds->rwork; | |
598 | 10 | ksizes = ds->iwork; | |
599 | 10 | iwork = ds->iwork+nblks; | |
600 |
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10 | PetscCall(PetscArrayzero(iwork,liwork)); |
601 | |||
602 | /* Copy matrix to block tridiagonal format */ | ||
603 |
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10 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
604 | j=0; | ||
605 |
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55 | for (i=0;i<nblks;i++) { |
606 | 45 | ksizes[i]=bs; | |
607 |
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180 | for (k=0;k<bs;k++) |
608 |
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540 | for (m=0;m<bs;m++) |
609 | 405 | D[k+m*bs+i*bs*bs] = PetscRealPart(A[j+k+(j+m)*n]); | |
610 | 45 | j = j + bs; | |
611 | } | ||
612 | j=0; | ||
613 |
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45 | for (i=0;i<nblks-1;i++) { |
614 |
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140 | for (k=0;k<bs;k++) |
615 |
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420 | for (m=0;m<bs;m++) |
616 | 315 | E[k+m*lde+i*lde*lde] = PetscRealPart(A[j+bs+k+(j+m)*n]); | |
617 | 35 | j = j + bs; | |
618 | } | ||
619 |
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10 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
620 | |||
621 | /* Solve the block tridiagonal eigenproblem */ | ||
622 |
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10 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q)); |
623 |
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10 | PetscCall(BDC_dsbtdc_("D","A",n,nblks,ksizes,D,bs,bs,E,lde,lde,tol,tau1,tau2,d,Q,n,rwork,lrwork,iwork,liwork,&mingap,&mingapi,&info,1,1)); |
624 |
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10 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q)); |
625 |
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145 | for (i=0;i<ds->n;i++) wr[i] = d[i]; |
626 | |||
627 | /* Create diagonal matrix as a result */ | ||
628 |
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10 | if (ds->compact) PetscCall(PetscArrayzero(e,ds->n-1)); |
629 | else { | ||
630 |
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10 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
631 |
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145 | for (i=0;i<ds->n;i++) PetscCall(PetscArrayzero(A+i*ld,ds->n)); |
632 |
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145 | for (i=0;i<ds->n;i++) A[i+i*ld] = wr[i]; |
633 |
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10 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
634 | } | ||
635 |
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10 | PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&d)); |
636 | |||
637 | /* Set zero wi */ | ||
638 |
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10 | if (wi) for (i=0;i<ds->n;i++) wi[i] = 0.0; |
639 |
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2 | PetscFunctionReturn(PETSC_SUCCESS); |
640 | } | ||
641 | #endif | ||
642 | |||
643 | 24557 | static PetscErrorCode DSTruncate_HEP(DS ds,PetscInt n,PetscBool trim) | |
644 | { | ||
645 | 24557 | PetscInt i,ld=ds->ld,l=ds->l; | |
646 | 24557 | PetscScalar *A; | |
647 | |||
648 |
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24557 | PetscFunctionBegin; |
649 |
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24557 | if (!ds->compact && ds->extrarow) PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
650 |
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24557 | if (trim) { |
651 |
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2637 | if (!ds->compact && ds->extrarow) { /* clean extra row */ |
652 | ✗ | for (i=l;i<ds->n;i++) A[ds->n+i*ld] = 0.0; | |
653 | } | ||
654 | 2637 | ds->l = 0; | |
655 | 2637 | ds->k = 0; | |
656 | 2637 | ds->n = n; | |
657 | 2637 | ds->t = ds->n; /* truncated length equal to the new dimension */ | |
658 | } else { | ||
659 |
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21920 | if (!ds->compact && ds->extrarow && ds->k==ds->n) { |
660 | /* copy entries of extra row to the new position, then clean last row */ | ||
661 | ✗ | for (i=l;i<n;i++) A[n+i*ld] = A[ds->n+i*ld]; | |
662 | ✗ | for (i=l;i<ds->n;i++) A[ds->n+i*ld] = 0.0; | |
663 | } | ||
664 |
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21920 | ds->k = (ds->extrarow)? n: 0; |
665 | 21920 | ds->t = ds->n; /* truncated length equal to previous dimension */ | |
666 | 21920 | ds->n = n; | |
667 | } | ||
668 |
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24557 | if (!ds->compact && ds->extrarow) PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
669 |
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4759 | PetscFunctionReturn(PETSC_SUCCESS); |
670 | } | ||
671 | |||
672 | #if !defined(PETSC_HAVE_MPIUNI) | ||
673 | 20 | static PetscErrorCode DSSynchronize_HEP(DS ds,PetscScalar eigr[],PetscScalar eigi[]) | |
674 | { | ||
675 | 20 | PetscInt ld=ds->ld,l=ds->l,k=0,kr=0; | |
676 | 20 | PetscMPIInt n,rank,off=0,size,ldn,ld3; | |
677 | 20 | PetscScalar *A,*Q; | |
678 | 20 | PetscReal *T; | |
679 | |||
680 |
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20 | PetscFunctionBegin; |
681 |
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20 | if (ds->compact) kr = 3*ld; |
682 | ✗ | else k = (ds->n-l)*ld; | |
683 |
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20 | if (ds->state>DS_STATE_RAW) k += (ds->n-l)*ld; |
684 |
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20 | if (eigr) k += (ds->n-l); |
685 |
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20 | PetscCall(DSAllocateWork_Private(ds,k+kr,0,0)); |
686 |
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20 | PetscCall(PetscMPIIntCast(k*sizeof(PetscScalar)+kr*sizeof(PetscReal),&size)); |
687 |
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20 | PetscCall(PetscMPIIntCast(ds->n-l,&n)); |
688 |
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20 | PetscCall(PetscMPIIntCast(ld*(ds->n-l),&ldn)); |
689 |
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20 | PetscCall(PetscMPIIntCast(ld*3,&ld3)); |
690 |
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20 | if (ds->compact) PetscCall(DSGetArrayReal(ds,DS_MAT_T,&T)); |
691 | ✗ | else PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); | |
692 |
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20 | if (ds->state>DS_STATE_RAW) PetscCall(MatDenseGetArray(ds->omat[DS_MAT_Q],&Q)); |
693 |
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20 | PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)ds),&rank)); |
694 |
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20 | if (!rank) { |
695 |
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10 | if (ds->compact) PetscCallMPI(MPI_Pack(T,ld3,MPIU_REAL,ds->work,size,&off,PetscObjectComm((PetscObject)ds))); |
696 | ✗ | else PetscCallMPI(MPI_Pack(A+l*ld,ldn,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds))); | |
697 |
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10 | if (ds->state>DS_STATE_RAW) PetscCallMPI(MPI_Pack(Q+l*ld,ldn,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds))); |
698 |
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10 | if (eigr) PetscCallMPI(MPI_Pack(eigr+l,n,MPIU_SCALAR,ds->work,size,&off,PetscObjectComm((PetscObject)ds))); |
699 | } | ||
700 |
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40 | PetscCallMPI(MPI_Bcast(ds->work,size,MPI_BYTE,0,PetscObjectComm((PetscObject)ds))); |
701 |
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20 | if (rank) { |
702 |
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10 | if (ds->compact) PetscCallMPI(MPI_Unpack(ds->work,size,&off,T,ld3,MPIU_REAL,PetscObjectComm((PetscObject)ds))); |
703 | ✗ | else PetscCallMPI(MPI_Unpack(ds->work,size,&off,A+l*ld,ldn,MPIU_SCALAR,PetscObjectComm((PetscObject)ds))); | |
704 |
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10 | if (ds->state>DS_STATE_RAW) PetscCallMPI(MPI_Unpack(ds->work,size,&off,Q+l*ld,ldn,MPIU_SCALAR,PetscObjectComm((PetscObject)ds))); |
705 |
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10 | if (eigr) PetscCallMPI(MPI_Unpack(ds->work,size,&off,eigr+l,n,MPIU_SCALAR,PetscObjectComm((PetscObject)ds))); |
706 | } | ||
707 |
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20 | if (ds->compact) PetscCall(DSRestoreArrayReal(ds,DS_MAT_T,&T)); |
708 | ✗ | else PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); | |
709 |
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20 | if (ds->state>DS_STATE_RAW) PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_Q],&Q)); |
710 |
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4 | PetscFunctionReturn(PETSC_SUCCESS); |
711 | } | ||
712 | #endif | ||
713 | |||
714 | 1326 | static PetscErrorCode DSCond_HEP(DS ds,PetscReal *cond) | |
715 | { | ||
716 | 1326 | PetscScalar *work; | |
717 | 1326 | PetscReal *rwork; | |
718 | 1326 | PetscBLASInt *ipiv; | |
719 | 1326 | PetscBLASInt lwork,info,n,ld; | |
720 | 1326 | PetscReal hn,hin; | |
721 | 1326 | PetscScalar *A; | |
722 | |||
723 |
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1326 | PetscFunctionBegin; |
724 |
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1326 | PetscCall(PetscBLASIntCast(ds->n,&n)); |
725 |
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1326 | PetscCall(PetscBLASIntCast(ds->ld,&ld)); |
726 | 1326 | lwork = 8*ld; | |
727 |
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1326 | PetscCall(DSAllocateWork_Private(ds,lwork,ld,ld)); |
728 | 1326 | work = ds->work; | |
729 | 1326 | rwork = ds->rwork; | |
730 | 1326 | ipiv = ds->iwork; | |
731 |
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1326 | if (ds->compact) PetscCall(DSAllocateMat_Private(ds,DS_MAT_A)); |
732 |
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1326 | PetscCall(DSSwitchFormat_HEP(ds)); |
733 | |||
734 | /* use workspace matrix W to avoid overwriting A */ | ||
735 |
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1326 | PetscCall(DSAllocateMat_Private(ds,DS_MAT_W)); |
736 |
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1326 | PetscCall(MatCopy(ds->omat[DS_MAT_A],ds->omat[DS_MAT_W],SAME_NONZERO_PATTERN)); |
737 |
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1326 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_W],&A)); |
738 | |||
739 | /* norm of A */ | ||
740 | 1326 | hn = LAPACKlange_("I",&n,&n,A,&ld,rwork); | |
741 | |||
742 | /* norm of inv(A) */ | ||
743 |
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1326 | PetscCallBLAS("LAPACKgetrf",LAPACKgetrf_(&n,&n,A,&ld,ipiv,&info)); |
744 |
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1326 | SlepcCheckLapackInfo("getrf",info); |
745 |
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1326 | PetscCallBLAS("LAPACKgetri",LAPACKgetri_(&n,A,&ld,ipiv,work,&lwork,&info)); |
746 |
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1326 | SlepcCheckLapackInfo("getri",info); |
747 | 1326 | hin = LAPACKlange_("I",&n,&n,A,&ld,rwork); | |
748 |
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1326 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_W],&A)); |
749 | |||
750 | 1326 | *cond = hn*hin; | |
751 |
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1326 | PetscFunctionReturn(PETSC_SUCCESS); |
752 | } | ||
753 | |||
754 | 124 | static PetscErrorCode DSTranslateRKS_HEP(DS ds,PetscScalar alpha) | |
755 | { | ||
756 | 124 | PetscInt i,j,k=ds->k; | |
757 | 124 | PetscScalar *Q,*A,*R,*tau,*work; | |
758 | 124 | PetscBLASInt ld,n1,n0,lwork,info; | |
759 | |||
760 |
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124 | PetscFunctionBegin; |
761 |
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124 | PetscCall(PetscBLASIntCast(ds->ld,&ld)); |
762 |
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124 | PetscCall(DSAllocateWork_Private(ds,ld*ld,0,0)); |
763 | 124 | tau = ds->work; | |
764 | 124 | work = ds->work+ld; | |
765 |
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124 | PetscCall(PetscBLASIntCast(ld*(ld-1),&lwork)); |
766 |
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124 | PetscCall(DSAllocateMat_Private(ds,DS_MAT_W)); |
767 |
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124 | PetscCall(MatDenseGetArray(ds->omat[DS_MAT_A],&A)); |
768 |
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124 | PetscCall(MatDenseGetArrayWrite(ds->omat[DS_MAT_Q],&Q)); |
769 |
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124 | PetscCall(MatDenseGetArrayWrite(ds->omat[DS_MAT_W],&R)); |
770 | |||
771 | /* copy I+alpha*A */ | ||
772 |
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124 | PetscCall(PetscArrayzero(Q,ld*ld)); |
773 |
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124 | PetscCall(PetscArrayzero(R,ld*ld)); |
774 |
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1828 | for (i=0;i<k;i++) { |
775 | 1704 | Q[i+i*ld] = 1.0 + alpha*A[i+i*ld]; | |
776 | 1704 | Q[k+i*ld] = alpha*A[k+i*ld]; | |
777 | } | ||
778 | |||
779 | /* compute qr */ | ||
780 |
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124 | PetscCall(PetscBLASIntCast(k+1,&n1)); |
781 |
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124 | PetscCall(PetscBLASIntCast(k,&n0)); |
782 |
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124 | PetscCallBLAS("LAPACKgeqrf",LAPACKgeqrf_(&n1,&n0,Q,&ld,tau,work,&lwork,&info)); |
783 |
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124 | SlepcCheckLapackInfo("geqrf",info); |
784 | |||
785 | /* copy R from Q */ | ||
786 |
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1828 | for (j=0;j<k;j++) |
787 |
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14538 | for (i=0;i<=j;i++) |
788 | 12834 | R[i+j*ld] = Q[i+j*ld]; | |
789 | |||
790 | /* compute orthogonal matrix in Q */ | ||
791 |
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124 | PetscCallBLAS("LAPACKorgqr",LAPACKorgqr_(&n1,&n1,&n0,Q,&ld,tau,work,&lwork,&info)); |
792 |
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124 | SlepcCheckLapackInfo("orgqr",info); |
793 | |||
794 | /* compute the updated matrix of projected problem */ | ||
795 |
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1828 | for (j=0;j<k;j++) |
796 |
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27372 | for (i=0;i<k+1;i++) |
797 | 25668 | A[j*ld+i] = Q[i*ld+j]; | |
798 | 124 | alpha = -1.0/alpha; | |
799 |
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124 | PetscCallBLAS("BLAStrsm",BLAStrsm_("R","U","N","N",&n1,&n0,&alpha,R,&ld,A,&ld)); |
800 |
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1828 | for (i=0;i<k;i++) |
801 | 1704 | A[ld*i+i] -= alpha; | |
802 | |||
803 |
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124 | PetscCall(MatDenseRestoreArray(ds->omat[DS_MAT_A],&A)); |
804 |
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124 | PetscCall(MatDenseRestoreArrayWrite(ds->omat[DS_MAT_Q],&Q)); |
805 |
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124 | PetscCall(MatDenseRestoreArrayWrite(ds->omat[DS_MAT_W],&R)); |
806 |
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21 | PetscFunctionReturn(PETSC_SUCCESS); |
807 | } | ||
808 | |||
809 | 236631 | static PetscErrorCode DSHermitian_HEP(DS ds,DSMatType m,PetscBool *flg) | |
810 | { | ||
811 |
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236631 | PetscFunctionBegin; |
812 |
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236631 | if (m==DS_MAT_A && !ds->extrarow) *flg = PETSC_TRUE; |
813 | 164693 | else *flg = PETSC_FALSE; | |
814 |
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236631 | PetscFunctionReturn(PETSC_SUCCESS); |
815 | } | ||
816 | |||
817 | 684 | static PetscErrorCode DSSetCompact_HEP(DS ds,PetscBool comp) | |
818 | { | ||
819 |
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684 | PetscFunctionBegin; |
820 |
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684 | if (!comp) PetscCall(DSAllocateMat_Private(ds,DS_MAT_A)); |
821 |
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126 | PetscFunctionReturn(PETSC_SUCCESS); |
822 | } | ||
823 | |||
824 | 48 | static PetscErrorCode DSReallocate_HEP(DS ds,PetscInt ld) | |
825 | { | ||
826 | 48 | PetscInt i,*perm=ds->perm; | |
827 | |||
828 |
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48 | PetscFunctionBegin; |
829 |
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1104 | for (i=0;i<DS_NUM_MAT;i++) { |
830 |
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1056 | if (!ds->compact && i==DS_MAT_A) continue; |
831 |
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1056 | if (i!=DS_MAT_Q && i!=DS_MAT_T) PetscCall(MatDestroy(&ds->omat[i])); |
832 | } | ||
833 | |||
834 |
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48 | if (!ds->compact) PetscCall(DSReallocateMat_Private(ds,DS_MAT_A,ld)); |
835 |
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48 | PetscCall(DSReallocateMat_Private(ds,DS_MAT_Q,ld)); |
836 |
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48 | PetscCall(DSReallocateMat_Private(ds,DS_MAT_T,ld)); |
837 | |||
838 |
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48 | PetscCall(PetscMalloc1(ld,&ds->perm)); |
839 |
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48 | PetscCall(PetscArraycpy(ds->perm,perm,ds->ld)); |
840 |
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48 | PetscCall(PetscFree(perm)); |
841 |
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10 | PetscFunctionReturn(PETSC_SUCCESS); |
842 | } | ||
843 | |||
844 | /*MC | ||
845 | DSHEP - Dense Hermitian Eigenvalue Problem. | ||
846 | |||
847 | Level: beginner | ||
848 | |||
849 | Notes: | ||
850 | The problem is expressed as A*X = X*Lambda, where A is real symmetric | ||
851 | (or complex Hermitian). Lambda is a diagonal matrix whose diagonal | ||
852 | elements are the arguments of DSSolve(). After solve, A is overwritten | ||
853 | with Lambda. | ||
854 | |||
855 | In the intermediate state A is reduced to tridiagonal form. In compact | ||
856 | storage format, the symmetric tridiagonal matrix is stored in T. | ||
857 | |||
858 | Used DS matrices: | ||
859 | + DS_MAT_A - problem matrix (used only if compact=false) | ||
860 | . DS_MAT_T - symmetric tridiagonal matrix | ||
861 | - DS_MAT_Q - orthogonal/unitary transformation that reduces to tridiagonal form | ||
862 | (intermediate step) or matrix of orthogonal eigenvectors, which is equal to X | ||
863 | |||
864 | Implemented methods: | ||
865 | + 0 - Implicit QR (_steqr) | ||
866 | . 1 - Multiple Relatively Robust Representations (_stevr) | ||
867 | . 2 - Divide and Conquer (_stedc) | ||
868 | - 3 - Block Divide and Conquer (real scalars only) | ||
869 | |||
870 | .seealso: DSCreate(), DSSetType(), DSType | ||
871 | M*/ | ||
872 | 3430 | SLEPC_EXTERN PetscErrorCode DSCreate_HEP(DS ds) | |
873 | { | ||
874 |
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3430 | PetscFunctionBegin; |
875 | 3430 | ds->ops->allocate = DSAllocate_HEP; | |
876 | 3430 | ds->ops->view = DSView_HEP; | |
877 | 3430 | ds->ops->vectors = DSVectors_HEP; | |
878 | 3430 | ds->ops->solve[0] = DSSolve_HEP_QR; | |
879 | 3430 | ds->ops->solve[1] = DSSolve_HEP_MRRR; | |
880 | 3430 | ds->ops->solve[2] = DSSolve_HEP_DC; | |
881 | #if !defined(PETSC_USE_COMPLEX) | ||
882 | 1742 | ds->ops->solve[3] = DSSolve_HEP_BDC; | |
883 | #endif | ||
884 | 3430 | ds->ops->sort = DSSort_HEP; | |
885 | 3430 | ds->ops->truncate = DSTruncate_HEP; | |
886 | 3430 | ds->ops->update = DSUpdateExtraRow_HEP; | |
887 | 3430 | ds->ops->cond = DSCond_HEP; | |
888 | 3430 | ds->ops->transrks = DSTranslateRKS_HEP; | |
889 | 3430 | ds->ops->hermitian = DSHermitian_HEP; | |
890 | #if !defined(PETSC_HAVE_MPIUNI) | ||
891 | 3430 | ds->ops->synchronize = DSSynchronize_HEP; | |
892 | #endif | ||
893 | 3430 | ds->ops->setcompact = DSSetCompact_HEP; | |
894 | 3430 | ds->ops->reallocate = DSReallocate_HEP; | |
895 |
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3430 | PetscFunctionReturn(PETSC_SUCCESS); |
896 | } | ||
897 |