GCC Code Coverage Report

Directory: ./
File: src/eps/tutorials/ex7.c
Date: 2025-10-04 04:19:13
Exec Total Coverage
Lines: 68 95 71.6%
Functions: 1 1 100.0%
Branches: 201 472 42.6%
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[] = "Solves a generalized eigensystem Ax=kBx with matrices loaded from a file.\n\n"
12 "The command line options are:\n"
13 " -f1 <filename> -f2 <filename>, PETSc binary files containing A and B.\n"
14 " -evecs <filename>, output file to save computed eigenvectors.\n"
15 " -ninitial <nini>, number of user-provided initial guesses.\n"
16 " -finitial <filename>, binary file containing <nini> vectors.\n"
17 " -nconstr <ncon>, number of user-provided constraints.\n"
18 " -fconstr <filename>, binary file containing <ncon> vectors.\n\n";
19
20 #include <slepceps.h>
21
22 13 int main(int argc,char **argv)
23 {
24 13 Mat A,B; /* matrices */
25 13 EPS eps; /* eigenproblem solver context */
26 13 ST st;
27 13 KSP ksp;
28 13 EPSType type;
29 13 PetscReal tol;
30 13 Vec xr,xi,*Iv,*Cv;
31 13 PetscInt nev,maxit,i,its,lits,nconv,nini=0,ncon=0;
32 13 char filename[PETSC_MAX_PATH_LEN];
33 13 PetscViewer viewer;
34 13 PetscBool flg,evecs,ishermitian,terse;
35
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 13 PetscFunctionBeginUser;
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 13 PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
38
39 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
40 Load the matrices that define the eigensystem, Ax=kBx
41 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
42
43
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 13 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nGeneralized eigenproblem stored in file.\n\n"));
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 13 PetscCall(PetscOptionsGetString(NULL,NULL,"-f1",filename,sizeof(filename),&flg));
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 13 PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"Must indicate a file name for matrix A with the -f1 option");
46
47 #if defined(PETSC_USE_COMPLEX)
48
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 3 PetscCall(PetscPrintf(PETSC_COMM_WORLD," Reading COMPLEX matrices from binary files...\n"));
49 #else
50
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 10 PetscCall(PetscPrintf(PETSC_COMM_WORLD," Reading REAL matrices from binary files...\n"));
51 #endif
52
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 13 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
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 13 PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
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 13 PetscCall(MatSetFromOptions(A));
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 13 PetscCall(MatLoad(A,viewer));
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 13 PetscCall(PetscViewerDestroy(&viewer));
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 13 PetscCall(PetscOptionsGetString(NULL,NULL,"-f2",filename,sizeof(filename),&flg));
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 13 if (flg) {
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 13 PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
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 13 PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
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 13 PetscCall(MatSetFromOptions(B));
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 13 PetscCall(MatLoad(B,viewer));
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 13 PetscCall(PetscViewerDestroy(&viewer));
65 } else {
66 ✗ PetscCall(PetscPrintf(PETSC_COMM_WORLD," Matrix B was not provided, setting B=I\n\n"));
67 ✗ B = NULL;
68 }
69
70
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 13 PetscCall(MatCreateVecs(A,NULL,&xr));
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 13 PetscCall(MatCreateVecs(A,NULL,&xi));
72
73 /*
74 Read user constraints if available
75 */
76
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 13 PetscCall(PetscOptionsGetInt(NULL,NULL,"-nconstr",&ncon,&flg));
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 13 if (flg) {
78 ✗ PetscCheck(ncon>0,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"The number of constraints must be >0");
79 ✗ PetscCall(PetscOptionsGetString(NULL,NULL,"-fconstr",filename,sizeof(filename),&flg));
80 ✗ PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"Must specify the name of the file storing the constraints");
81 ✗ PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
82 ✗ PetscCall(VecDuplicateVecs(xr,ncon,&Cv));
83 ✗ for (i=0;i<ncon;i++) PetscCall(VecLoad(Cv[i],viewer));
84 ✗ PetscCall(PetscViewerDestroy(&viewer));
85 }
86
87 /*
88 Read initial guesses if available
89 */
90
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 13 PetscCall(PetscOptionsGetInt(NULL,NULL,"-ninitial",&nini,&flg));
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 13 if (flg) {
92 ✗ PetscCheck(nini>0,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"The number of initial vectors must be >0");
93 ✗ PetscCall(PetscOptionsGetString(NULL,NULL,"-finitial",filename,sizeof(filename),&flg));
94 ✗ PetscCheck(flg,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"Must specify the name of the file containing the initial vectors");
95 ✗ PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
96 ✗ PetscCall(VecDuplicateVecs(xr,nini,&Iv));
97 ✗ for (i=0;i<nini;i++) PetscCall(VecLoad(Iv[i],viewer));
98 ✗ PetscCall(PetscViewerDestroy(&viewer));
99 }
100
101 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
102 Create the eigensolver and set various options
103 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
104
105 /*
106 Create eigensolver context
107 */
108
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 13 PetscCall(EPSCreate(PETSC_COMM_WORLD,&eps));
109
110 /*
111 Set operators. In this case, it is a generalized eigenvalue problem
112 */
113
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 13 PetscCall(EPSSetOperators(eps,A,B));
114
115 /*
116 If the user provided initial guesses or constraints, pass them here
117 */
118
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 13 PetscCall(EPSSetInitialSpace(eps,nini,Iv));
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 13 PetscCall(EPSSetDeflationSpace(eps,ncon,Cv));
120
121 /*
122 Set solver parameters at runtime
123 */
124
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 13 PetscCall(EPSSetFromOptions(eps));
125
126 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
127 Solve the eigensystem
128 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
129
130
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 13 PetscCall(EPSSolve(eps));
131
132 /*
133 Optional: Get some information from the solver and display it
134 */
135
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 13 PetscCall(EPSGetIterationNumber(eps,&its));
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 13 PetscCall(PetscPrintf(PETSC_COMM_WORLD," Number of iterations of the method: %" PetscInt_FMT "\n",its));
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 13 PetscCall(EPSGetST(eps,&st));
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 13 PetscCall(STGetKSP(st,&ksp));
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 13 PetscCall(KSPGetTotalIterations(ksp,&lits));
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 13 PetscCall(PetscPrintf(PETSC_COMM_WORLD," Number of linear iterations of the method: %" PetscInt_FMT "\n",lits));
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 13 PetscCall(EPSGetType(eps,&type));
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 13 PetscCall(PetscPrintf(PETSC_COMM_WORLD," Solution method: %s\n\n",type));
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 13 PetscCall(EPSGetDimensions(eps,&nev,NULL,NULL));
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 13 PetscCall(PetscPrintf(PETSC_COMM_WORLD," Number of requested eigenvalues: %" PetscInt_FMT "\n",nev));
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 13 PetscCall(EPSGetTolerances(eps,&tol,&maxit));
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 13 PetscCall(PetscPrintf(PETSC_COMM_WORLD," Stopping condition: tol=%.4g, maxit=%" PetscInt_FMT "\n",(double)tol,maxit));
147
148 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
149 Display solution and clean up
150 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
151
152 /*
153 Show detailed info unless -terse option is given by user
154 */
155
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 13 PetscCall(PetscOptionsHasName(NULL,NULL,"-terse",&terse));
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 13 if (terse) PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
157 else {
158 ✗ PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL));
159 ✗ PetscCall(EPSConvergedReasonView(eps,PETSC_VIEWER_STDOUT_WORLD));
160 ✗ PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD));
161 ✗ PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
162 }
163
164 /*
165 Save eigenvectors, if requested
166 */
167
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 13 PetscCall(PetscOptionsGetString(NULL,NULL,"-evecs",filename,sizeof(filename),&evecs));
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 13 PetscCall(EPSGetConverged(eps,&nconv));
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 13 if (nconv>0 && evecs) {
170 ✗ PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_WRITE,&viewer));
171 ✗ PetscCall(EPSIsHermitian(eps,&ishermitian));
172 ✗ for (i=0;i<nconv;i++) {
173 ✗ PetscCall(EPSGetEigenvector(eps,i,xr,xi));
174 ✗ PetscCall(VecView(xr,viewer));
175 #if !defined(PETSC_USE_COMPLEX)
176 ✗ if (!ishermitian) PetscCall(VecView(xi,viewer));
177 #endif
178 }
179 ✗ PetscCall(PetscViewerDestroy(&viewer));
180 }
181
182 /*
183 Free work space
184 */
185
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 13 PetscCall(EPSDestroy(&eps));
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 13 PetscCall(MatDestroy(&A));
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 13 PetscCall(MatDestroy(&B));
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 13 PetscCall(VecDestroy(&xr));
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 13 PetscCall(VecDestroy(&xi));
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 13 if (nini > 0) PetscCall(VecDestroyVecs(nini,&Iv));
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 13 if (ncon > 0) PetscCall(VecDestroyVecs(ncon,&Cv));
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 13 PetscCall(SlepcFinalize());
193 return 0;
194 }
195
196 /*TEST
197
198 test:
199 suffix: 1
200 args: -f1 ${SLEPC_DIR}/share/slepc/datafiles/matrices/bfw62a.petsc -f2 ${SLEPC_DIR}/share/slepc/datafiles/matrices/bfw62b.petsc -eps_nev 4 -terse
201 requires: double !complex !defined(PETSC_USE_64BIT_INDICES)
202
203 test:
204 suffix: ciss_1
205 args: -f1 ${DATAFILESPATH}/matrices/complex/mhd1280a.petsc -f2 ${DATAFILESPATH}/matrices/complex/mhd1280b.petsc -eps_type ciss -eps_ciss_usest 0 -eps_ciss_quadrule chebyshev -rg_type ring -rg_ring_center 0 -rg_ring_radius .49 -rg_ring_width 0.2 -rg_ring_startangle .25 -rg_ring_endangle .49 -terse -eps_max_it 1
206 requires: double complex datafilespath !defined(PETSC_USE_64BIT_INDICES)
207 timeoutfactor: 2
208
209 test:
210 suffix: 3 # test problem (A,A)
211 args: -f1 ${SLEPC_DIR}/share/slepc/datafiles/matrices/bfw62a.petsc -f2 ${SLEPC_DIR}/share/slepc/datafiles/matrices/bfw62a.petsc -eps_nev 4 -terse
212 requires: double !complex !defined(PETSC_USE_64BIT_INDICES)
213
214 TEST*/
215