Actual source code: test28.c
slepc-3.22.1 2024-10-28
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[] = "Tests multiple calls to EPSSolve with different matrix of different size.\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;
21: EPS eps;
22: PetscInt N,n=10,m=11,Istart,Iend,II,nev=3,i,j;
23: PetscBool flag,terse;
25: PetscFunctionBeginUser;
26: PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
27: PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
28: PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,&flag));
29: N = n*m;
30: PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\n2-D Laplacian Eigenproblem, N=%" PetscInt_FMT " (%" PetscInt_FMT "x%" PetscInt_FMT " grid)\n\n",N,n,m));
32: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
33: Create the 2-D Laplacian with coarse mesh
34: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
36: PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
37: PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N));
38: PetscCall(MatSetFromOptions(A));
39: PetscCall(MatGetOwnershipRange(A,&Istart,&Iend));
40: for (II=Istart;II<Iend;II++) {
41: i = II/n; j = II-i*n;
42: if (i>0) PetscCall(MatSetValue(A,II,II-n,-1.0,INSERT_VALUES));
43: if (i<m-1) PetscCall(MatSetValue(A,II,II+n,-1.0,INSERT_VALUES));
44: if (j>0) PetscCall(MatSetValue(A,II,II-1,-1.0,INSERT_VALUES));
45: if (j<n-1) PetscCall(MatSetValue(A,II,II+1,-1.0,INSERT_VALUES));
46: PetscCall(MatSetValue(A,II,II,4.0,INSERT_VALUES));
47: }
48: PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
49: PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));
51: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
52: Create the eigensolver, set options and solve the eigensystem
53: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
55: PetscCall(EPSCreate(PETSC_COMM_WORLD,&eps));
56: PetscCall(EPSSetOperators(eps,A,NULL));
57: PetscCall(EPSSetProblemType(eps,EPS_HEP));
58: PetscCall(EPSSetWhichEigenpairs(eps,EPS_SMALLEST_REAL));
59: PetscCall(EPSSetDimensions(eps,nev,PETSC_DETERMINE,PETSC_DETERMINE));
60: PetscCall(EPSSetFromOptions(eps));
62: PetscCall(EPSSolve(eps));
64: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
65: Display solution of first solve
66: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
68: PetscCall(PetscOptionsHasName(NULL,NULL,"-terse",&terse));
69: if (terse) PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
70: else {
71: PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL));
72: PetscCall(EPSConvergedReasonView(eps,PETSC_VIEWER_STDOUT_WORLD));
73: PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD));
74: PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
75: }
77: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
78: Create the 2-D Laplacian with finer mesh
79: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
81: n *= 2;
82: m *= 2;
83: N = n*m;
84: PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\n2-D Laplacian Eigenproblem, N=%" PetscInt_FMT " (%" PetscInt_FMT "x%" PetscInt_FMT " grid)\n\n",N,n,m));
86: PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
87: PetscCall(MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,N,N));
88: PetscCall(MatSetFromOptions(B));
89: PetscCall(MatGetOwnershipRange(B,&Istart,&Iend));
90: for (II=Istart;II<Iend;II++) {
91: i = II/n; j = II-i*n;
92: if (i>0) PetscCall(MatSetValue(B,II,II-n,-1.0,INSERT_VALUES));
93: if (i<m-1) PetscCall(MatSetValue(B,II,II+n,-1.0,INSERT_VALUES));
94: if (j>0) PetscCall(MatSetValue(B,II,II-1,-1.0,INSERT_VALUES));
95: if (j<n-1) PetscCall(MatSetValue(B,II,II+1,-1.0,INSERT_VALUES));
96: PetscCall(MatSetValue(B,II,II,4.0,INSERT_VALUES));
97: }
98: PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY));
99: PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY));
101: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
102: Solve again, calling EPSReset() since matrix size has changed
103: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
105: /* PetscCall(EPSReset(eps)); */ /* not required, will be called in EPSSetOperators() */
106: PetscCall(EPSSetOperators(eps,B,NULL));
107: PetscCall(EPSSolve(eps));
109: if (terse) PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
110: else {
111: PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL));
112: PetscCall(EPSConvergedReasonView(eps,PETSC_VIEWER_STDOUT_WORLD));
113: PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD));
114: PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
115: }
117: PetscCall(EPSDestroy(&eps));
118: PetscCall(MatDestroy(&A));
119: PetscCall(MatDestroy(&B));
120: PetscCall(SlepcFinalize());
121: return 0;
122: }
124: /*TEST
126: testset:
127: requires: !single
128: output_file: output/test28_1.out
129: test:
130: suffix: 1
131: args: -eps_type {{krylovschur arnoldi gd rqcg lobpcg lapack}} -terse
132: test:
133: suffix: 1_jd
134: args: -eps_type jd -vec_mdot_use_gemv 0 -terse
135: test:
136: suffix: 1_lanczos
137: args: -eps_type lanczos -eps_lanczos_reorthog local -terse
139: test:
140: suffix: 2
141: args: -eps_type {{power subspace}} -eps_target 8 -st_type sinvert -terse
143: testset:
144: args: -eps_interval 0.5,0.67 -terse
145: output_file: output/test28_3.out
146: test:
147: suffix: 3
148: args: -st_type sinvert -st_pc_type cholesky
149: requires: !single
150: test:
151: suffix: 3_evsl
152: nsize: {{1 2}}
153: args: -eps_type evsl -eps_evsl_dos_method lanczos
154: requires: evsl
156: TEST*/