Date: 2024-09-25T09:34:16+00:00

Actual source code: test4.c
slepc-3.21.2 2024-09-25
Report Typos and Errors

      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 an SVD problem with more columns than rows.\n\n"
     12:   "The command line options are:\n"
     13:   "  -m <m>, where <m> = matrix rows.\n"
     14:   "  -n <n>, where <n> = matrix columns (defaults to m+2).\n\n";

     16: #include <slepcsvd.h>

     18: /*
     19:    This example computes the singular values of a rectangular bidiagonal matrix

     21:               |  1  2                     |
     22:               |     1  2                  |
     23:               |        1  2               |
     24:           A = |          .  .             |
     25:               |             .  .          |
     26:               |                1  2       |
     27:               |                   1  2    |
     28:  */

     30: int main(int argc,char **argv)
     31: {
     32:   Mat                  A,B;
     33:   SVD                  svd;
     34:   SVDConv              conv;
     35:   SVDStop              stop;
     36:   SVDWhich             which;
     37:   SVDProblemType       ptype;
     38:   SVDConvergedReason   reason;
     39:   PetscInt             m=20,n,Istart,Iend,i,col[2],its;
     40:   PetscScalar          value[] = { 1, 2 };
     41:   PetscBool            flg,tmode;
     42:   PetscViewerAndFormat *vf;
     43:   const char           *ctest[] = { "absolute", "relative to the singular value", "user-defined" };
     44:   const char           *stest[] = { "basic", "user-defined" };

     46:   PetscFunctionBeginUser;
     47:   PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));

     49:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL));
     50:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,&flg));
     51:   if (!flg) n=m+2;
     52:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nRectangular bidiagonal matrix, m=%" PetscInt_FMT " n=%" PetscInt_FMT "\n\n",m,n));

     54:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     55:         Generate the matrix
     56:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

     58:   PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
     59:   PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,m,n));
     60:   PetscCall(MatSetFromOptions(A));

     62:   PetscCall(MatGetOwnershipRange(A,&Istart,&Iend));
     63:   for (i=Istart;i<Iend;i++) {
     64:     col[0]=i; col[1]=i+1;
     65:     if (i<n-1) PetscCall(MatSetValues(A,1,&i,2,col,value,INSERT_VALUES));
     66:     else if (i==n-1) PetscCall(MatSetValue(A,i,col[0],value[0],INSERT_VALUES));
     67:   }

     69:   PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
     70:   PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));

     72:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     73:         Compute singular values
     74:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

     76:   PetscCall(SVDCreate(PETSC_COMM_WORLD,&svd));
     77:   PetscCall(SVDSetOperators(svd,A,NULL));

     79:   /* test some interface functions */
     80:   PetscCall(SVDGetOperators(svd,&B,NULL));
     81:   PetscCall(MatView(B,PETSC_VIEWER_STDOUT_WORLD));
     82:   PetscCall(SVDSetConvergenceTest(svd,SVD_CONV_ABS));
     83:   PetscCall(SVDSetStoppingTest(svd,SVD_STOP_BASIC));
     84:   /* test monitors */
     85:   PetscCall(PetscViewerAndFormatCreate(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_DEFAULT,&vf));
     86:   PetscCall(SVDMonitorSet(svd,(PetscErrorCode (*)(SVD,PetscInt,PetscInt,PetscReal*,PetscReal*,PetscInt,void*))SVDMonitorFirst,vf,(PetscErrorCode (*)(void**))PetscViewerAndFormatDestroy));
     87:   /* PetscCall(SVDMonitorCancel(svd)); */
     88:   PetscCall(SVDSetFromOptions(svd));

     90:   /* query properties and print them */
     91:   PetscCall(SVDGetProblemType(svd,&ptype));
     92:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Problem type = %d",(int)ptype));
     93:   PetscCall(SVDIsGeneralized(svd,&flg));
     94:   if (flg) PetscCall(PetscPrintf(PETSC_COMM_WORLD," generalized"));
     95:   PetscCall(SVDGetImplicitTranspose(svd,&tmode));
     96:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\n Transpose mode is %s\n",tmode?"implicit":"explicit"));
     97:   PetscCall(SVDGetConvergenceTest(svd,&conv));
     98:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Convergence test is %s\n",ctest[conv]));
     99:   PetscCall(SVDGetStoppingTest(svd,&stop));
    100:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Stopping test is %s\n",stest[stop]));
    101:   PetscCall(SVDGetWhichSingularTriplets(svd,&which));
    102:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Which = %s\n",which?"smallest":"largest"));

    104:   /* call the solver */
    105:   PetscCall(SVDSolve(svd));
    106:   PetscCall(SVDGetConvergedReason(svd,&reason));
    107:   PetscCall(SVDGetIterationNumber(svd,&its));
    108:   PetscCall(PetscPrintf(PETSC_COMM_WORLD," Finished - converged reason = %d\n",(int)reason));
    109:   /* PetscCall(PetscPrintf(PETSC_COMM_WORLD," its = %" PetscInt_FMT "\n",its)); */

    111:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    112:                     Display solution and clean up
    113:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
    114:   PetscCall(SVDErrorView(svd,SVD_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD));
    115:   PetscCall(SVDDestroy(&svd));
    116:   PetscCall(MatDestroy(&A));
    117:   PetscCall(SlepcFinalize());
    118:   return 0;
    119: }

    121: /*TEST

    123:    testset:
    124:       args: -svd_monitor_cancel
    125:       filter: grep -v "Transpose mode"
    126:       output_file: output/test4_1.out
    127:       test:
    128:          suffix: 1_lanczos
    129:          args: -svd_type lanczos
    130:       test:
    131:          suffix: 1_randomized
    132:          args: -svd_type randomized
    133:       test:
    134:          suffix: 1_trlanczos
    135:          args: -svd_type trlanczos -svd_ncv 12 -svd_trlanczos_restart 0.6
    136:       test:
    137:          suffix: 1_cross
    138:          args: -svd_type cross
    139:       test:
    140:          suffix: 1_cross_exp
    141:          args: -svd_type cross -svd_cross_explicitmatrix
    142:       test:
    143:          suffix: 1_cross_exp_imp
    144:          args: -svd_type cross -svd_cross_explicitmatrix -svd_implicittranspose
    145:          requires: !complex
    146:       test:
    147:          suffix: 1_cyclic
    148:          args: -svd_type cyclic
    149:       test:
    150:          suffix: 1_cyclic_imp
    151:          args: -svd_type cyclic -svd_implicittranspose
    152:       test:
    153:          suffix: 1_cyclic_exp
    154:          args: -svd_type cyclic -svd_cyclic_explicitmatrix
    155:       test:
    156:          suffix: 1_lapack
    157:          args: -svd_type lapack
    158:       test:
    159:          suffix: 1_scalapack
    160:          args: -svd_type scalapack
    161:          requires: scalapack

    163:    testset:
    164:       args: -svd_monitor_cancel -mat_type aijcusparse
    165:       requires: cuda !single
    166:       filter: grep -v "Transpose mode" | sed -e "s/seqaijcusparse/seqaij/"
    167:       output_file: output/test4_1.out
    168:       test:
    169:          suffix: 2_cuda_lanczos
    170:          args: -svd_type lanczos
    171:       test:
    172:          suffix: 2_cuda_trlanczos
    173:          args: -svd_type trlanczos -svd_ncv 12
    174:       test:
    175:          suffix: 2_cuda_cross
    176:          args: -svd_type cross

    178:    test:
    179:       suffix: 3
    180:       nsize: 2
    181:       args: -svd_type trlanczos -svd_ncv 14 -svd_monitor_cancel -ds_parallel synchronized

    183: TEST*/