Actual source code: test18.c
slepc-3.19.2 2023-09-05
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-, 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"
14: " -m <m>, where <m> = number of grid subdivisions in y dimension.\n\n";
16: #include <slepceps.h>
18: int main(int argc,char **argv)
19: {
20: Mat A,B; /* problem matrices */
21: EPS eps; /* eigenproblem solver context */
22: PetscInt N,n=10,m,Istart,Iend,II,nev,i,j;
23: PetscBool flag,terse;
25: PetscFunctionBeginUser;
26: PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
27: PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
28: PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,&flag));
29: if (!flag) m=n;
30: N = n*m;
31: PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nSymmetric-indefinite eigenproblem, N=%" PetscInt_FMT "\n\n",N));
33: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
34: Compute the matrices that define the eigensystem, Ax=kBx
35: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
37: PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
38: PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N));
39: PetscCall(MatSetFromOptions(A));
40: PetscCall(MatSetUp(A));
42: PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
43: PetscCall(MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,N,N));
44: PetscCall(MatSetFromOptions(B));
45: PetscCall(MatSetUp(B));
47: PetscCall(MatGetOwnershipRange(A,&Istart,&Iend));
48: for (II=Istart;II<Iend;II++) {
49: i = II/n; j = II-i*n;
50: if (i>0) PetscCall(MatSetValue(A,II,II-n,-1.0,INSERT_VALUES));
51: if (i<m-1) PetscCall(MatSetValue(A,II,II+n,-1.0,INSERT_VALUES));
52: if (j>0) PetscCall(MatSetValue(A,II,II-1,-1.0,INSERT_VALUES));
53: if (j<n-1) PetscCall(MatSetValue(A,II,II+1,-1.0,INSERT_VALUES));
54: PetscCall(MatSetValue(A,II,II,4.0,INSERT_VALUES));
55: PetscCall(MatSetValue(B,II,N-II-1,1.0,INSERT_VALUES));
56: }
58: PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
59: PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY));
60: PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));
61: PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY));
63: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
64: Create the eigensolver and set various options
65: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
67: PetscCall(EPSCreate(PETSC_COMM_WORLD,&eps));
68: PetscCall(EPSSetOperators(eps,A,B));
69: PetscCall(EPSSetProblemType(eps,EPS_GHIEP));
70: PetscCall(EPSSetFromOptions(eps));
72: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
73: Solve the eigensystem
74: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
76: PetscCall(EPSSolve(eps));
77: PetscCall(EPSGetDimensions(eps,&nev,NULL,NULL));
78: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Number of requested eigenvalues: %" PetscInt_FMT "\n",nev));
80: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
81: Display solution and clean up
82: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
84: /* show detailed info unless -terse option is given by user */
85: PetscCall(PetscOptionsHasName(NULL,NULL,"-terse",&terse));
86: if (terse) PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
87: else {
88: PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL));
89: PetscCall(EPSConvergedReasonView(eps,PETSC_VIEWER_STDOUT_WORLD));
90: PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD));
91: PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
92: }
94: PetscCall(EPSDestroy(&eps));
95: PetscCall(MatDestroy(&A));
96: PetscCall(MatDestroy(&B));
97: PetscCall(SlepcFinalize());
98: return 0;
99: }
101: /*TEST
103: testset:
104: args: -eps_nev 4 -eps_ncv 12 -terse -st_type sinvert -eps_krylovschur_restart .3
105: requires: !single
106: output_file: output/test18_1.out
107: test:
108: suffix: 1_ks
109: test:
110: suffix: 1_ks_gnhep
111: args: -eps_gen_non_hermitian
112: requires: !__float128
113: test:
114: suffix: 2_cuda_ks
115: args: -mat_type aijcusparse
116: requires: cuda
117: test:
118: suffix: 2_cuda_ks_gnhep
119: args: -eps_gen_non_hermitian -mat_type aijcusparse
120: requires: cuda
122: test:
123: suffix: 2
124: args: -n 10 -m 11 -eps_type {{gd jd}} -eps_target 0.2 -eps_harmonic -eps_nev 2 -eps_ncv 11 -terse
125: requires: !single
126: filter: sed -e "s/[+-]0\.0*i//g"
128: TEST*/