Date: 2026-03-09T09:12:05+00:00

Actual source code: test2.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 SVD with different builds with a matrix loaded from a file.\n\n"
     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],path[PETSC_MAX_PATH_LEN];
     21:   const char     *prefix,*scalar,*ints,*floats;
     22:   PetscReal      tol=PETSC_SMALL;
     23:   PetscViewer    viewer;
     24:   PetscBool      flg;

     26:   PetscFunctionBeginUser;
     27:   PetscCall(SlepcInitialize(&argc,&argv,NULL,help));

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

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

     60:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     61:                      Create the SVD solver
     62:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     63:   PetscCall(SVDCreate(PETSC_COMM_WORLD,&svd));
     64:   PetscCall(SVDSetOperators(svd,A,NULL));
     65:   PetscCall(SVDSetTolerances(svd,tol,PETSC_CURRENT));
     66:   PetscCall(SVDSetFromOptions(svd));

     68:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     69:                 Compute the singular triplets and display solution
     70:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     71:   PetscCall(SVDSolve(svd));
     72:   PetscCall(SVDErrorView(svd,SVD_ERROR_RELATIVE,NULL));
     73:   PetscCall(SVDDestroy(&svd));
     74:   PetscCall(MatDestroy(&A));
     75:   PetscCall(SlepcFinalize());
     76:   return 0;
     77: }

     79: /*TEST

     81:    build:
     82:       requires: !__float128

     84:    test:
     85:       args: -svd_nsv 7 -svd_type {{lanczos trlanczos cross cyclic lapack randomized}} -path ${DATAFILESPATH}/matrices/petsc-small
     86:       requires: !single datafilespath

     88:    testset:
     89:       args: -svd_nsv 7 -svd_mpd 11 -svd_type primme -path ${DATAFILESPATH}/matrices/petsc-small
     90:       requires: primme !single datafilespath
     91:       output_file: output/test2_1.out
     92:       test:
     93:          suffix: 1_primme
     94:       test:
     95:          suffix: 1_primme_args
     96:          args: -svd_primme_blocksize 2 -svd_primme_method hybrid

     98: TEST*/