Actual source code: test18.c
slepc-3.11.2 2019-07-30
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-2019, Universitat Politecnica de Valencia, Spain
6: This file is part of SLEPc.
7: SLEPc is distributed under a 2-clause BSD license (see LICENSE).
8: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9: */
11: static char help[] = "Symmetric-indefinite eigenproblem.\n\n"
12: "The command line options are:\n"
13: " -n <n>, where <n> = number of grid subdivisions in x dimension.\n\n";
15: #include <slepceps.h>
17: int main(int argc,char **argv)
18: {
19: Mat A,B; /* problem matrices */
20: EPS eps; /* eigenproblem solver context */
21: PetscInt N,n=10,Istart,Iend,II,nev,i,j;
22: PetscBool terse;
25: SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
26: PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
27: N = n*n;
28: PetscPrintf(PETSC_COMM_WORLD,"\nSymmetric-indefinite eigenproblem, N=%D\n\n",N);
30: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
31: Compute the matrices that define the eigensystem, Ax=kBx
32: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
34: MatCreate(PETSC_COMM_WORLD,&A);
35: MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N);
36: MatSetFromOptions(A);
37: MatSetUp(A);
39: MatCreate(PETSC_COMM_WORLD,&B);
40: MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,N,N);
41: MatSetFromOptions(B);
42: MatSetUp(B);
44: MatGetOwnershipRange(A,&Istart,&Iend);
45: for (II=Istart;II<Iend;II++) {
46: i = II/n; j = II-i*n;
47: if (i>0) { MatSetValue(A,II,II-n,-1.0,INSERT_VALUES); }
48: if (i<n-1) { MatSetValue(A,II,II+n,-1.0,INSERT_VALUES); }
49: if (j>0) { MatSetValue(A,II,II-1,-1.0,INSERT_VALUES); }
50: if (j<n-1) { MatSetValue(A,II,II+1,-1.0,INSERT_VALUES); }
51: MatSetValue(A,II,II,4.0,INSERT_VALUES);
52: MatSetValue(B,II,N-II-1,1.0,INSERT_VALUES);
53: }
55: MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
56: MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);
57: MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
58: MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);
60: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
61: Create the eigensolver and set various options
62: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
64: EPSCreate(PETSC_COMM_WORLD,&eps);
65: EPSSetOperators(eps,A,B);
66: EPSSetProblemType(eps,EPS_GHIEP);
67: EPSSetFromOptions(eps);
69: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
70: Solve the eigensystem
71: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
73: EPSSolve(eps);
74: EPSGetDimensions(eps,&nev,NULL,NULL);
75: PetscPrintf(PETSC_COMM_WORLD," Number of requested eigenvalues: %D\n",nev);
77: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
78: Display solution and clean up
79: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
81: /* show detailed info unless -terse option is given by user */
82: PetscOptionsHasName(NULL,NULL,"-terse",&terse);
83: if (terse) {
84: EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);
85: } else {
86: PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL);
87: EPSReasonView(eps,PETSC_VIEWER_STDOUT_WORLD);
88: EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD);
89: PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);
90: }
92: EPSDestroy(&eps);
93: MatDestroy(&A);
94: MatDestroy(&B);
95: SlepcFinalize();
96: return ierr;
97: }
99: /*TEST
101: testset:
102: args: -eps_nev 4 -eps_ncv 12 -terse -st_type sinvert -eps_krylovschur_restart .3
103: output_file: output/test18_1.out
104: test:
105: suffix: 1_ks
106: requires: !single
107: test:
108: suffix: 1_ks_gnhep
109: args: -eps_gen_non_hermitian
110: requires: !single
111: test:
112: suffix: 2_cuda_ks
113: args: -mat_type aijcusparse
114: requires: cuda !single
115: test:
116: suffix: 2_cuda_ks_gnhep
117: args: -eps_gen_non_hermitian -mat_type aijcusparse
118: requires: cuda !single
120: test:
121: suffix: 1_davidson
122: args: -eps_type {{gd jd}} -eps_target 0 -eps_harmonic -eps_nev 4 -eps_ncv 12 -terse
123: requires: !single !complex
124: output_file: output/test18_1.out
125: TEST*/