Actual source code: ex17.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[] = "Solves a polynomial eigenproblem P(l)x = 0 with matrices loaded from a file.\n\n"
12: "The command line options are:\n"
13: "-A <filename1,filename2, ...> , where <filename1,.. > = matrices A0 ... files in PETSc binary form.\n\n";
15: #include <slepcpep.h>
17: #define MAX_MATRICES 40
19: int main(int argc,char **argv)
20: {
21: Mat A[MAX_MATRICES]; /* problem matrices */
22: PEP pep; /* polynomial eigenproblem solver context */
23: PetscReal tol;
24: PetscInt nev,maxit,its,nmat=MAX_MATRICES,i;
25: char* filenames[MAX_MATRICES];
26: PetscViewer viewer;
27: PetscBool flg,terse;
30: SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
32: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
33: Load the matrices that define the polynomial eigenproblem
34: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
36: PetscPrintf(PETSC_COMM_WORLD,"\nPolynomial eigenproblem stored in file.\n\n");
37: #if defined(PETSC_USE_COMPLEX)
38: PetscPrintf(PETSC_COMM_WORLD," Reading COMPLEX matrices from binary files...\n");
39: #else
40: PetscPrintf(PETSC_COMM_WORLD," Reading REAL matrices from binary files...\n");
41: #endif
42: PetscOptionsGetStringArray(NULL,NULL,"-A",filenames,&nmat,&flg);
43: if (!flg) SETERRQ(PETSC_COMM_WORLD,1,"Must indicate a comma-separated list of file names with the -A option");
44: for (i=0;i<nmat;i++) {
45: PetscViewerBinaryOpen(PETSC_COMM_WORLD,filenames[i],FILE_MODE_READ,&viewer);
46: MatCreate(PETSC_COMM_WORLD,&A[i]);
47: MatSetFromOptions(A[i]);
48: MatLoad(A[i],viewer);
49: PetscViewerDestroy(&viewer);
50: }
51: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
52: Create the eigensolver and set various options
53: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
55: /*
56: Create eigensolver context
57: */
58: PEPCreate(PETSC_COMM_WORLD,&pep);
60: /*
61: Set matrices
62: */
63: PEPSetOperators(pep,nmat,A);
64: /*
65: Set solver parameters at runtime
66: */
67: PEPSetFromOptions(pep);
69: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
70: Solve the eigensystem
71: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
73: PEPSolve(pep);
74: PEPGetIterationNumber(pep,&its);
75: PetscPrintf(PETSC_COMM_WORLD," Number of iterations of the method: %D\n",its);
77: /*
78: Optional: Get some information from the solver and display it
79: */
80: PEPGetDimensions(pep,&nev,NULL,NULL);
81: PetscPrintf(PETSC_COMM_WORLD," Number of requested eigenvalues: %D\n",nev);
82: PEPGetTolerances(pep,&tol,&maxit);
83: PetscPrintf(PETSC_COMM_WORLD," Stopping condition: tol=%.4g, maxit=%D\n",(double)tol,maxit);
85: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
86: Display solution and clean up
87: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
89: /* show detailed info unless -terse option is given by user */
90: PetscOptionsHasName(NULL,NULL,"-terse",&terse);
91: if (terse) {
92: PEPErrorView(pep,PEP_ERROR_BACKWARD,NULL);
93: } else {
94: PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL);
95: PEPReasonView(pep,PETSC_VIEWER_STDOUT_WORLD);
96: PEPErrorView(pep,PEP_ERROR_BACKWARD,PETSC_VIEWER_STDOUT_WORLD);
97: PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);
98: }
99: PEPDestroy(&pep);
100: for (i=0;i<nmat;i++) {
101: MatDestroy(&A[i]);
102: PetscFree(filenames[i]);
103: }
104: SlepcFinalize();
105: return ierr;
106: }
108: /*TEST
110: test:
111: suffix: 1
112: args: -A ${SLEPC_DIR}/share/slepc/datafiles/matrices/speaker107k.petsc,${SLEPC_DIR}/share/slepc/datafiles/matrices/speaker107c.petsc,${SLEPC_DIR}/share/slepc/datafiles/matrices/speaker107m.petsc -pep_type {{toar qarnoldi linear}} -pep_nev 4 -pep_ncv 20 -pep_scale scalar -terse
113: requires: double !complex !define(PETSC_USE_64BIT_INDICES)
115: TEST*/