Actual source code: ex17.c
slepc-3.17.1 2022-04-11
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[] = "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;
29: SlepcInitialize(&argc,&argv,(char*)0,help);
31: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
32: Load the matrices that define the polynomial eigenproblem
33: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
35: PetscPrintf(PETSC_COMM_WORLD,"\nPolynomial eigenproblem stored in file.\n\n");
36: #if defined(PETSC_USE_COMPLEX)
37: PetscPrintf(PETSC_COMM_WORLD," Reading COMPLEX matrices from binary files...\n");
38: #else
39: PetscPrintf(PETSC_COMM_WORLD," Reading REAL matrices from binary files...\n");
40: #endif
41: PetscOptionsGetStringArray(NULL,NULL,"-A",filenames,&nmat,&flg);
43: for (i=0;i<nmat;i++) {
44: PetscViewerBinaryOpen(PETSC_COMM_WORLD,filenames[i],FILE_MODE_READ,&viewer);
45: MatCreate(PETSC_COMM_WORLD,&A[i]);
46: MatSetFromOptions(A[i]);
47: MatLoad(A[i],viewer);
48: PetscViewerDestroy(&viewer);
49: }
50: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
51: Create the eigensolver and set various options
52: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
54: /*
55: Create eigensolver context
56: */
57: PEPCreate(PETSC_COMM_WORLD,&pep);
59: /*
60: Set matrices
61: */
62: PEPSetOperators(pep,nmat,A);
63: /*
64: Set solver parameters at runtime
65: */
66: PEPSetFromOptions(pep);
68: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
69: Solve the eigensystem
70: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
72: PEPSolve(pep);
73: PEPGetIterationNumber(pep,&its);
74: PetscPrintf(PETSC_COMM_WORLD," Number of iterations of the method: %" PetscInt_FMT "\n",its);
76: /*
77: Optional: Get some information from the solver and display it
78: */
79: PEPGetDimensions(pep,&nev,NULL,NULL);
80: PetscPrintf(PETSC_COMM_WORLD," Number of requested eigenvalues: %" PetscInt_FMT "\n",nev);
81: PEPGetTolerances(pep,&tol,&maxit);
82: PetscPrintf(PETSC_COMM_WORLD," Stopping condition: tol=%.4g, maxit=%" PetscInt_FMT "\n",(double)tol,maxit);
84: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
85: Display solution and clean up
86: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
88: /* show detailed info unless -terse option is given by user */
89: PetscOptionsHasName(NULL,NULL,"-terse",&terse);
90: if (terse) PEPErrorView(pep,PEP_ERROR_BACKWARD,NULL);
91: else {
92: PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL);
93: PEPConvergedReasonView(pep,PETSC_VIEWER_STDOUT_WORLD);
94: PEPErrorView(pep,PEP_ERROR_BACKWARD,PETSC_VIEWER_STDOUT_WORLD);
95: PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);
96: }
97: PEPDestroy(&pep);
98: for (i=0;i<nmat;i++) {
99: MatDestroy(&A[i]);
100: PetscFree(filenames[i]);
101: }
102: SlepcFinalize();
103: return 0;
104: }
106: /*TEST
108: test:
109: suffix: 1
110: 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
111: requires: double !complex !defined(PETSC_USE_64BIT_INDICES)
113: TEST*/