GCC Code Coverage Report


Directory: ./
File: src/eps/tutorials/ex58.c
Date: 2026-04-06 03:57:41
Exec Total Coverage
Lines: 96 116 82.8%
Functions: 1 1 100.0%
Branches: 317 588 53.9%

Line Branch Exec Source
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 static char help[] = "Linear Response eigenvalue problem.\n\n"
12 "The command line options are:\n"
13 " -n <n>, where <n> = dimension of the blocks.\n"
14 " -reduced <0/1>, to use the reduced form of the LREP.\n"
15 " -A <filename>, A matrix.\n"
16 " -B <filename>, B matrix.\n\n";
17
18 #include <slepceps.h>
19
20 /*
21 This example is similar to ex55.c, but with a real matrix
22
23 H = [ A B
24 -B -A ],
25
26 where A,B are real symmetric with the following Toeplitz structure:
27
28 A = pentadiag{a,b,c,b,a}
29 B = tridiag{b,d,b}
30
31 where a,b,c,d are real values.
32
33 Alternatively, use -A and -B command-line options to load matrices from file.
34 */
35
36 154 int main(int argc,char **argv)
37 {
38 154 Mat H,A,B,K,M; /* problem matrices */
39 154 EPS eps; /* eigenproblem solver context */
40 154 PetscScalar a,b,c,d;
41 154 PetscReal lev;
42 154 PetscInt n=24,Istart,Iend,i,nconv;
43 154 PetscBool flg,terse,checkorthog,nest=PETSC_FALSE,reduced=PETSC_FALSE;
44 154 Vec t,*x,*y;
45 154 PetscViewer viewer;
46 154 char filename[PETSC_MAX_PATH_LEN];
47
48
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154 PetscFunctionBeginUser;
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154 PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
50 154 PetscCheck(!PetscDefined(USE_COMPLEX),PETSC_COMM_SELF,PETSC_ERR_SUP,"This example cannot be used with complex scalars");
51
52
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154 PetscCall(PetscOptionsGetBool(NULL,NULL,"-reduced",&reduced,NULL));
53
54 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
55 Compute (or load) the problem matrices A and B
56 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
57
58
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154 PetscCall(PetscOptionsHasName(NULL,NULL,"-A",&flg));
59
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154 if (flg) {
61
62 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nLinear Response Eigenvalue Problem stored in file%s\n\n",reduced?" (reduced)":""));
63 PetscCall(PetscPrintf(PETSC_COMM_WORLD," Reading REAL matrices from a binary file...\n"));
64
65 PetscCall(PetscOptionsGetString(NULL,NULL,"-A",filename,sizeof(filename),&flg));
66 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
67 PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
68 PetscCall(MatSetFromOptions(A));
69 PetscCall(MatLoad(A,viewer));
70 PetscCall(PetscViewerDestroy(&viewer));
71
72 PetscCall(PetscOptionsGetString(NULL,NULL,"-B",filename,sizeof(filename),&flg));
73 PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"Must indicate file for both A and B matrices");
74 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
75 PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
76 PetscCall(MatSetFromOptions(B));
77 PetscCall(MatLoad(B,viewer));
78 PetscCall(PetscViewerDestroy(&viewer));
79
80 } else {
81
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154 PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
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231 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nLinear Response Eigenvalue Problem, n=%" PetscInt_FMT "%s\n\n",n,reduced?" (reduced)":""));
84
85 154 a = -0.1;
86 154 b = 1.0;
87 154 c = 4.5;
88 154 d = 2.0;
89
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154 PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
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154 PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n));
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154 PetscCall(MatSetFromOptions(A));
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154 PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
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154 PetscCall(MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,n,n));
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154 PetscCall(MatSetFromOptions(B));
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98
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154 PetscCall(MatGetOwnershipRange(A,&Istart,&Iend));
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3358 for (i=Istart;i<Iend;i++) {
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3204 if (i>1) PetscCall(MatSetValue(A,i,i-2,a,INSERT_VALUES));
101
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3204 if (i>0) PetscCall(MatSetValue(A,i,i-1,b,INSERT_VALUES));
102
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3204 PetscCall(MatSetValue(A,i,i,c,INSERT_VALUES));
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3204 if (i<n-1) PetscCall(MatSetValue(A,i,i+1,b,INSERT_VALUES));
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3204 if (i<n-2) PetscCall(MatSetValue(A,i,i+2,a,INSERT_VALUES));
105 }
106
107
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154 PetscCall(MatGetOwnershipRange(B,&Istart,&Iend));
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3358 for (i=Istart;i<Iend;i++) {
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3204 if (i>0) PetscCall(MatSetValue(B,i,i-1,b,INSERT_VALUES));
110
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3204 PetscCall(MatSetValue(B,i,i,d,INSERT_VALUES));
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3204 if (i<n-1) PetscCall(MatSetValue(B,i,i+1,b,INSERT_VALUES));
112 }
113
114
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154 PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
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154 PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY));
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154 PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));
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154 PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY));
118 }
119
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154 if (reduced) {
121
122 77 PetscInt ma,na,Ma,Na;
123 77 const PetscScalar scal[] = { 1.0, -1.0 };
124
125
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77 PetscCall(MatGetSize(A,&Ma,&Na));
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77 PetscCall(MatGetLocalSize(A,&ma,&na));
127
128 /* K = A-B */
129
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77 PetscCall(MatCreate(PetscObjectComm((PetscObject)A),&K));
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77 PetscCall(MatSetSizes(K,ma,na,Ma,Na));
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77 PetscCall(MatSetType(K,MATCOMPOSITE));
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77 PetscCall(MatCompositeAddMat(K,A));
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77 PetscCall(MatCompositeAddMat(K,B));
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77 PetscCall(MatAssemblyBegin(K,MAT_FINAL_ASSEMBLY));
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77 PetscCall(MatAssemblyEnd(K,MAT_FINAL_ASSEMBLY));
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77 PetscCall(MatCompositeSetScalings(K,scal));
137
138 /* M = A+B */
139
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77 PetscCall(MatCreate(PetscObjectComm((PetscObject)A),&M));
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77 PetscCall(MatSetSizes(M,ma,na,Ma,Na));
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77 PetscCall(MatSetType(M,MATCOMPOSITE));
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77 PetscCall(MatCompositeAddMat(M,A));
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77 PetscCall(MatCompositeAddMat(M,B));
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77 PetscCall(MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY));
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77 PetscCall(MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY));
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77 PetscCall(MatCreateLREP(K,M,reduced,&H));
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77 PetscCall(MatDestroy(&K));
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77 PetscCall(MatDestroy(&M));
150
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77 } else PetscCall(MatCreateLREP(A,B,reduced,&H));
152
153 /* if you prefer, set the vector type so that MatCreateVecs() returns nested vectors */
154
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154 PetscCall(PetscOptionsGetBool(NULL,NULL,"-nest",&nest,NULL));
155
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154 if (nest) PetscCall(MatNestSetVecType(H,VECNEST));
156
157 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
158 Create the eigensolver and set various options
159 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
160
161
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154 PetscCall(EPSCreate(PETSC_COMM_WORLD,&eps));
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154 PetscCall(EPSSetOperators(eps,H,NULL));
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154 PetscCall(EPSSetProblemType(eps,EPS_LREP));
164
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154 PetscCall(EPSSetFromOptions(eps));
165
166 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
167 Solve the eigensystem and display solution
168 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
169
170
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154 PetscCall(EPSSolve(eps));
171
172 /* show detailed info unless -terse option is given by user */
173
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154 PetscCall(PetscOptionsHasName(NULL,NULL,"-terse",&terse));
174
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154 if (terse) PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
175 else {
176 PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL));
177 PetscCall(EPSConvergedReasonView(eps,PETSC_VIEWER_STDOUT_WORLD));
178 PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD));
179 PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
180 }
181
182 /* check bi-orthogonality */
183
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154 PetscCall(PetscOptionsHasName(NULL,NULL,"-checkorthog",&checkorthog));
184
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154 PetscCall(EPSGetConverged(eps,&nconv));
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154 if (checkorthog && nconv>0) {
186
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154 PetscCall(MatCreateVecs(H,&t,NULL));
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154 PetscCall(VecDuplicateVecs(t,nconv,&x));
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154 PetscCall(VecDuplicateVecs(t,nconv,&y));
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2330 for (i=0;i<nconv;i++) {
190
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2176 PetscCall(EPSGetEigenvector(eps,i,x[i],NULL));
191
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2176 PetscCall(EPSGetLeftEigenvector(eps,i,y[i],NULL));
192 }
193
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154 PetscCall(VecCheckOrthogonality(x,nconv,y,nconv,NULL,NULL,&lev));
194
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154 if (lev<100*PETSC_MACHINE_EPSILON) PetscCall(PetscPrintf(PETSC_COMM_WORLD," Level of bi-orthogonality of eigenvectors < 100*eps\n\n"));
195 else PetscCall(PetscPrintf(PETSC_COMM_WORLD," Level of bi-orthogonality of eigenvectors: %g\n\n",(double)lev));
196
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154 PetscCall(VecDestroy(&t));
197
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154 PetscCall(VecDestroyVecs(nconv,&x));
198
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154 PetscCall(VecDestroyVecs(nconv,&y));
199 }
200
201
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154 PetscCall(EPSDestroy(&eps));
202
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154 PetscCall(MatDestroy(&A));
203
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154 PetscCall(MatDestroy(&B));
204
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154 PetscCall(MatDestroy(&H));
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154 PetscCall(SlepcFinalize());
206 return 0;
207 }
208
209 /*TEST
210
211 build:
212 requires: !complex
213
214 testset:
215 args: -eps_nev 4 -eps_ncv 16 -terse -checkorthog -reduced {{0 1}} -nest {{0 1}}
216 nsize: {{1 2}}
217 filter: sed -e "s/ (reduced)//"
218 output_file: output/ex58_1.out
219 test:
220 suffix: 1
221 test:
222 suffix: 1_dense
223 args: -mat_type dense
224 test:
225 suffix: 1_cuda
226 args: -mat_type aijcusparse
227 requires: cuda
228 test:
229 suffix: 1_hip
230 args: -mat_type aijhipsparse
231 requires: hip
232
233 test:
234 args: -n 90 -eps_threshold_absolute 2.4 -eps_ncv 10 -terse -checkorthog -reduced {{0 1}}
235 filter: sed -e "s/ (reduced)//"
236 suffix: 2
237
238 TEST*/
239