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],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*/