Date: 2024-09-25T09:34:16+00:00

Actual source code: test2.c
slepc-3.21.2 2024-09-25
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      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 SVD with different builds with a matrix loaded from a file"
     12:   " (matrices available in PETSc's distribution).\n\n";

     14: #include <slepcsvd.h>

     16: int main(int argc,char **argv)
     17: {
     18:   Mat            A;               /* operator matrix */
     19:   SVD            svd;             /* singular value problem solver context */
     20:   char           filename[PETSC_MAX_PATH_LEN];
     21:   const char     *prefix,*scalar,*ints,*floats;
     22:   PetscReal      tol=PETSC_SMALL;
     23:   PetscViewer    viewer;

     25:   PetscFunctionBeginUser;
     26:   PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));

     28:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     29:         Load the matrix for which the SVD must be computed
     30:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     31: #if defined(PETSC_USE_COMPLEX)
     32:   prefix = "nh";
     33:   scalar = "complex";
     34: #else
     35:   prefix = "ns";
     36:   scalar = "real";
     37: #endif
     38: #if defined(PETSC_USE_64BIT_INDICES)
     39:   ints   = "int64";
     40: #else
     41:   ints   = "int32";
     42: #endif
     43: #if defined(PETSC_USE_REAL_DOUBLE)
     44:   floats = "float64";
     45: #elif defined(PETSC_USE_REAL_SINGLE)
     46:   floats = "float32";
     47: #endif

     49:   PetscCall(PetscSNPrintf(filename,sizeof(filename),"%s/share/petsc/datafiles/matrices/%s-%s-%s-%s",PETSC_DIR,prefix,scalar,ints,floats));
     50:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nReading matrix from binary file...\n\n"));
     51:   PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
     52:   PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
     53:   PetscCall(MatSetFromOptions(A));
     54:   PetscCall(MatLoad(A,viewer));
     55:   PetscCall(PetscViewerDestroy(&viewer));

     57:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     58:                      Create the SVD solver
     59:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     60:   PetscCall(SVDCreate(PETSC_COMM_WORLD,&svd));
     61:   PetscCall(SVDSetOperators(svd,A,NULL));
     62:   PetscCall(SVDSetTolerances(svd,tol,PETSC_DEFAULT));
     63:   PetscCall(SVDSetFromOptions(svd));

     65:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     66:                 Compute the singular triplets and display solution
     67:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     68:   PetscCall(SVDSolve(svd));
     69:   PetscCall(SVDErrorView(svd,SVD_ERROR_RELATIVE,NULL));
     70:   PetscCall(SVDDestroy(&svd));
     71:   PetscCall(MatDestroy(&A));
     72:   PetscCall(SlepcFinalize());
     73:   return 0;
     74: }

     76: /*TEST

     78:    build:
     79:       requires: !__float128

     81:    test:
     82:       args: -svd_nsv 7 -svd_type {{lanczos trlanczos cross cyclic lapack randomized}}
     83:       requires: !single

     85:    testset:
     86:       args: -svd_nsv 7 -svd_mpd 11 -svd_type primme
     87:       requires: primme !single
     88:       output_file: output/test2_1.out
     89:       test:
     90:          suffix: 1_primme
     91:       test:
     92:          suffix: 1_primme_args
     93:          args: -svd_primme_blocksize 2 -svd_primme_method hybrid

     95: TEST*/