Actual source code: test5.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 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;

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

 29:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 30:         Generate the matrix
 31:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 32:   MatCreate(PETSC_COMM_WORLD,&A);
 33:   MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);
 34:   MatSetFromOptions(A);
 35:   MatSetUp(A);
 36:   MatGetOwnershipRange(A,&Istart,&Iend);
 37:   for (i=Istart;i<Iend;i++) MatSetValue(A,i,i,i+1,INSERT_VALUES);
 38:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 39:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 41:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 42:                      Create the SVD solver
 43:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 44:   SVDCreate(PETSC_COMM_WORLD,&svd);
 45:   PetscObjectSetName((PetscObject)svd,"svd");
 46:   SVDSetOperators(svd,A,NULL);
 47:   SVDSetFromOptions(svd);

 49:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 50:                 Compute the singular triplets and display solution
 51:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 52:   SVDSolve(svd);
 53:   SVDErrorView(svd,SVD_ERROR_RELATIVE,NULL);

 55:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 56:                    Check file containing the singular values
 57:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 58:   PetscOptionsGetString(NULL,NULL,"-checkfile",filename,sizeof(filename),&checkfile);
 59:   if (checkfile) {
 60:     SVDGetConverged(svd,&nconv);
 61:     PetscMalloc1(nconv,&sigma);
 62:     PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer);
 63:     PetscViewerBinaryRead(viewer,sigma,nconv,NULL,PETSC_REAL);
 64:     PetscViewerDestroy(&viewer);
 65:     for (i=0;i<nconv;i++) {
 66:       SVDGetSingularTriplet(svd,i,&sval,NULL,NULL);
 68:     }
 69:     PetscFree(sigma);
 70:   }

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

 78: /*TEST

 80:    test:
 81:       suffix: 1
 82:       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
 83:       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"
 84:       requires: !single

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

 91:    test:
 92:       suffix: 3
 93:       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
 94:       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"
 95:       requires: !single

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

102: TEST*/