Date: 2022-03-31T15:29:21+00:00

Actual source code: test2.c
slepc-3.17.0 2022-03-31
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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:   SlepcInitialize(&argc,&argv,(char*)0,help);

     27:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     28:         Load the matrix for which the SVD must be computed
     29:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     30: #if defined(PETSC_USE_COMPLEX)
     31:   prefix = "nh";
     32:   scalar = "complex";
     33: #else
     34:   prefix = "ns";
     35:   scalar = "real";
     36: #endif
     37: #if defined(PETSC_USE_64BIT_INDICES)
     38:   ints   = "int64";
     39: #else
     40:   ints   = "int32";
     41: #endif
     42: #if defined(PETSC_USE_REAL_DOUBLE)
     43:   floats = "float64";
     44: #elif defined(PETSC_USE_REAL_SINGLE)
     45:   floats = "float32";
     46: #endif

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

     56:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     57:                      Create the SVD solver
     58:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     59:   SVDCreate(PETSC_COMM_WORLD,&svd);
     60:   SVDSetOperators(svd,A,NULL);
     61:   SVDSetTolerances(svd,tol,PETSC_DEFAULT);
     62:   SVDSetFromOptions(svd);

     64:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     65:                 Compute the singular triplets and display solution
     66:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     67:   SVDSolve(svd);
     68:   SVDErrorView(svd,SVD_ERROR_RELATIVE,NULL);
     69:   SVDDestroy(&svd);
     70:   MatDestroy(&A);
     71:   SlepcFinalize();
     72:   return 0;
     73: }

     75: /*TEST

     77:    build:
     78:       requires: !__float128

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

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

     94: TEST*/