Date: 2022-11-02T11:47:14+00:00

Actual source code: test5.c
slepc-3.18.1 2022-11-02
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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 view and monitor functionality.\n\n";

     13: #include <slepcsvd.h>

     15: int main(int argc,char **argv)
     16: {
     17:   Mat            A;
     18:   SVD            svd;
     19:   PetscReal      *sigma,sval;
     20:   PetscInt       n=6,Istart,Iend,i,nconv;
     21:   PetscBool      checkfile;
     22:   char           filename[PETSC_MAX_PATH_LEN];
     23:   PetscViewer    viewer;

     26:   SlepcInitialize(&argc,&argv,(char*)0,help);
     27:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
     28:   PetscPrintf(PETSC_COMM_WORLD,"\nSVD of diagonal matrix, n=%" PetscInt_FMT "\n\n",n);

     30:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     31:         Generate the matrix
     32:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     33:   MatCreate(PETSC_COMM_WORLD,&A);
     34:   MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);
     35:   MatSetFromOptions(A);
     36:   MatSetUp(A);
     37:   MatGetOwnershipRange(A,&Istart,&Iend);
     38:   for (i=Istart;i<Iend;i++) MatSetValue(A,i,i,i+1,INSERT_VALUES);
     39:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
     40:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

     42:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     43:                      Create the SVD solver
     44:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     45:   SVDCreate(PETSC_COMM_WORLD,&svd);
     46:   PetscObjectSetName((PetscObject)svd,"svd");
     47:   SVDSetOperators(svd,A,NULL);
     48:   SVDSetFromOptions(svd);

     50:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     51:                 Compute the singular triplets and display solution
     52:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     53:   SVDSolve(svd);
     54:   SVDErrorView(svd,SVD_ERROR_RELATIVE,NULL);

     56:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     57:                    Check file containing the singular values
     58:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     59:   PetscOptionsGetString(NULL,NULL,"-checkfile",filename,sizeof(filename),&checkfile);
     60:   if (checkfile) {
     61:     SVDGetConverged(svd,&nconv);
     62:     PetscMalloc1(nconv,&sigma);
     63:     PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer);
     64:     PetscViewerBinaryRead(viewer,sigma,nconv,NULL,PETSC_REAL);
     65:     PetscViewerDestroy(&viewer);
     66:     for (i=0;i<nconv;i++) {
     67:       SVDGetSingularTriplet(svd,i,&sval,NULL,NULL);
     69:     }
     70:     PetscFree(sigma);
     71:   }

     73:   SVDDestroy(&svd);
     74:   MatDestroy(&A);
     75:   SlepcFinalize();
     76:   return 0;
     77: }

     79: /*TEST

     81:    test:
     82:       suffix: 1
     83:       args: -svd_error_relative ::ascii_info_detail -svd_view_values -svd_monitor_conv -svd_error_absolute ::ascii_matlab -svd_monitor_all -svd_converged_reason -svd_view
     84:       filter: grep -v "tolerance" | grep -v "problem type" | sed -e "s/1.999999/2.000000/" | sed -e "s/2.000001/2.000000/" | sed -e "s/[0-9]\.[0-9]*e-\([0-9]*\)/removed/g"
     85:       requires: !single

     87:    test:
     88:       suffix: 2
     89:       args: -svd_nsv 4 -svd_view_values binary:myvalues.bin -checkfile myvalues.bin
     90:       requires: double

     92:    test:
     93:       suffix: 3
     94:       args: -svd_type trlanczos -svd_error_relative ::ascii_info_detail -svd_view_values -svd_monitor_conv -svd_error_absolute ::ascii_matlab -svd_monitor_all -svd_converged_reason -svd_view
     95:       filter: grep -v "tolerance" | grep -v "problem type" | sed -e "s/1.999999/2.000000/" | sed -e "s/2.000001/2.000000/" | sed -e "s/[0-9]\.[0-9]*e-\([0-9]*\)/removed/g"
     96:       requires: !single

     98:    test:
     99:       suffix: 4
    100:       args: -svd_monitor draw::draw_lg -svd_monitor_all draw::draw_lg -svd_view_values draw -draw_save mysingu.ppm -draw_virtual
    101:       requires: x !single

    103: TEST*/