Date: 2026-01-20T11:35:39+00:00

Actual source code: test5.c

      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[] = "Test EPS with different builds with a matrix loaded from a file.\n\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],path[PETSC_MAX_PATH_LEN];
     23:   const char     *prefix,*scalar,*ints,*floats;
     24:   PetscReal      tol=PETSC_SMALL;
     25:   PetscViewer    viewer;
     26:   PetscBool      flg,symm;

     28:   PetscFunctionBeginUser;
     29:   PetscCall(SlepcInitialize(&argc,&argv,NULL,help));

     31:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     32:         Load the operator matrix that defines the eigensystem, Ax=kx
     33:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     34:   PetscCall(PetscOptionsHasName(NULL,NULL,"-symm",&symm));
     35:   PetscCall(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:   PetscCall(PetscOptionsGetString(NULL,NULL,"-path",path,sizeof(path),&flg));
     56:   if (flg) PetscCall(PetscSNPrintf(filename,sizeof(filename),"%s/%s-%s-%s-%s",path,prefix,scalar,ints,floats));
     57:   else PetscCall(PetscSNPrintf(filename,sizeof(filename),"%s/share/petsc/datafiles/matrices/%s-%s-%s-%s",PETSC_DIR,prefix,scalar,ints,floats));
     58:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nReading matrix from binary file...\n\n"));
     59:   PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
     60:   PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
     61:   PetscCall(MatSetFromOptions(A));
     62:   PetscCall(MatLoad(A,viewer));
     63:   PetscCall(PetscViewerDestroy(&viewer));

     65:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     66:                      Create the eigensolver
     67:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     68:   PetscCall(EPSCreate(PETSC_COMM_WORLD,&eps));
     69:   PetscCall(EPSSetOperators(eps,A,NULL));
     70:   if (symm) PetscCall(EPSSetProblemType(eps,EPS_HEP));
     71:   else PetscCall(EPSSetProblemType(eps,EPS_NHEP));
     72:   PetscCall(EPSSetTolerances(eps,tol,PETSC_CURRENT));
     73:   PetscCall(EPSSetFromOptions(eps));

     75:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     76:                 Solve the eigensystem and display solution
     77:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     78:   PetscCall(EPSSolve(eps));
     79:   PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
     80:   PetscCall(EPSDestroy(&eps));
     81:   PetscCall(MatDestroy(&A));
     82:   PetscCall(SlepcFinalize());
     83:   return 0;
     84: }

     86: /*TEST

     88:    build:
     89:       requires: !__float128

     91:    testset:
     92:       args: -eps_nev 3 -path ${DATAFILESPATH}/matrices/petsc-small
     93:       requires: !complex datafilespath
     94:       filter: sed -e "s/92073/92072/" | sed -e "s/80649/80648/" | sed -e "s/80647/80648/" | sed -e "s/45755/45756/"
     95:       output_file: output/test5_1.out
     96:       test:
     97:          suffix: 1
     98:          args: -eps_type {{krylovschur subspace arnoldi gd}}
     99:       test:
    100:          suffix: 1_power
    101:          args: -eps_type power -st_type sinvert -eps_target 7
    102:       test:
    103:          suffix: 1_jd
    104:          args: -eps_type jd -eps_jd_minv 3 -eps_jd_plusk 1
    105:       test:
    106:          suffix: 1_gd
    107:          args: -eps_type gd -eps_gd_minv 3 -eps_gd_plusk 1
    108:       test:
    109:          suffix: 1_gd2
    110:          args: -eps_type gd -eps_gd_double_expansion

    112:    testset:
    113:       args: -eps_nev 3 -path ${DATAFILESPATH}/matrices/petsc-small
    114:       requires: double complex datafilespath
    115:       output_file: output/test5_1_complex.out
    116:       test:
    117:          suffix: 1_complex
    118:          args: -eps_type {{krylovschur subspace arnoldi gd}}
    119:       test:
    120:          suffix: 1_power_complex
    121:          args: -eps_type power -st_type sinvert -eps_target 7
    122:       test:
    123:          suffix: 1_jd_complex
    124:          args: -eps_type jd -eps_jd_minv 3 -eps_jd_plusk 1 -eps_max_it 2000
    125:       test:
    126:          suffix: 1_gd_complex
    127:          args: -eps_type gd -eps_gd_minv 3 -eps_gd_plusk 1
    128:       test:
    129:          suffix: 1_gd2_complex
    130:          args: -eps_type gd -eps_gd_double_expansion

    132:    testset:
    133:       args: -symm -eps_nev 4 -eps_smallest_real -path ${DATAFILESPATH}/matrices/petsc-small
    134:       requires: double !complex datafilespath
    135:       output_file: output/test5_2.out
    136:       test:
    137:         suffix: 2_arpack
    138:         args: -eps_type arpack
    139:         requires: arpack
    140:       test:
    141:         suffix: 2_blopex
    142:         args: -eps_type blopex
    143:         requires: blopex

    145:    testset:
    146:       args: -symm -eps_nev 4 -eps_smallest_real -path ${DATAFILESPATH}/matrices/petsc-small
    147:       requires: double complex datafilespath
    148:       output_file: output/test5_2_complex.out
    149:       test:
    150:         suffix: 2_blopex_complex
    151:         args: -eps_type blopex
    152:         requires: blopex

    154: TEST*/