Actual source code: test5.c
slepc-3.9.0 2018-04-12
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-2018, 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[] = "Test EPS with different builds with a matrix loaded from a file.\n"
12: "This test is based on ex4.c in tutorials.\n"
13: "It loads test matrices available in PETSc's distribution.\n"
14: "Add -symm or -herm to select the symmetric/Hermitian matrix.\n\n";
16: #include <slepceps.h>
18: int main(int argc,char **argv)
19: {
20: Mat A; /* operator matrix */
21: EPS eps; /* eigenproblem solver context */
22: char filename[PETSC_MAX_PATH_LEN];
23: const char *prefix,*scalar,*ints,*floats;
24: PetscReal tol=1000*PETSC_MACHINE_EPSILON;
25: PetscViewer viewer;
26: PetscBool flg,symm;
29: SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
31: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
32: Load the operator matrix that defines the eigensystem, Ax=kx
33: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
34: PetscOptionsHasName(NULL,NULL,"-symm",&symm);
35: PetscOptionsHasName(NULL,NULL,"-herm",&flg);
36: if (flg) symm=PETSC_TRUE;
37: #if defined(PETSC_USE_COMPLEX)
38: prefix = symm? "hpd": "nh";
39: scalar = "complex";
40: #else
41: prefix = symm? "spd": "ns";
42: scalar = "real";
43: #endif
44: #if defined(PETSC_USE_64BIT_INDICES)
45: ints = "int64";
46: #else
47: ints = "int32";
48: #endif
49: #if defined(PETSC_USE_REAL_DOUBLE)
50: floats = "float64";
51: #elif defined(PETSC_USE_REAL_SINGLE)
52: floats = "float32";
53: #endif
55: PetscSNPrintf(filename,PETSC_MAX_PATH_LEN,"%s/share/petsc/datafiles/matrices/%s-%s-%s-%s",PETSC_DIR,prefix,scalar,ints,floats);
56: PetscPrintf(PETSC_COMM_WORLD,"\nReading matrix from binary file...\n\n");
57: PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer);
58: MatCreate(PETSC_COMM_WORLD,&A);
59: MatSetFromOptions(A);
60: MatLoad(A,viewer);
61: PetscViewerDestroy(&viewer);
63: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
64: Create the eigensolver
65: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
66: EPSCreate(PETSC_COMM_WORLD,&eps);
67: EPSSetOperators(eps,A,NULL);
68: if (symm) {
69: EPSSetProblemType(eps,EPS_HEP);
70: } else {
71: EPSSetProblemType(eps,EPS_NHEP);
72: }
73: EPSSetTolerances(eps,tol,PETSC_DEFAULT);
74: EPSSetFromOptions(eps);
76: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
77: Solve the eigensystem and display solution
78: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
79: EPSSolve(eps);
80: EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);
81: EPSDestroy(&eps);
82: MatDestroy(&A);
83: SlepcFinalize();
84: return ierr;
85: }