Date: 2026-05-01T10:02:14+00:00

Actual source code: test3.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 BV operations with non-standard inner product.\n\n";

     13: #include <slepcbv.h>

     15: int main(int argc,char **argv)
     16: {
     17:   Vec            t,v;
     18:   Mat            B,M;
     19:   BV             X;
     20:   PetscInt       i,j,n=10,k=5,Istart,Iend;
     21:   PetscScalar    alpha;
     22:   PetscReal      nrm;
     23:   PetscViewer    view;
     24:   PetscBool      verbose;

     26:   PetscFunctionBeginUser;
     27:   PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
     28:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
     29:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-k",&k,NULL));
     30:   PetscCall(PetscOptionsHasName(NULL,NULL,"-verbose",&verbose));
     31:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Test BV with non-standard inner product (n=%" PetscInt_FMT ", k=%" PetscInt_FMT ").\n",n,k));

     33:   /* Create inner product matrix */
     34:   PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
     35:   PetscCall(MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,n,n));
     36:   PetscCall(MatSetFromOptions(B));
     37:   PetscCall(PetscObjectSetName((PetscObject)B,"B"));

     39:   PetscCall(MatGetOwnershipRange(B,&Istart,&Iend));
     40:   for (i=Istart;i<Iend;i++) {
     41:     if (i>0) PetscCall(MatSetValue(B,i,i-1,-1.0,INSERT_VALUES));
     42:     if (i<n-1) PetscCall(MatSetValue(B,i,i+1,-1.0,INSERT_VALUES));
     43:     PetscCall(MatSetValue(B,i,i,2.0,INSERT_VALUES));
     44:   }
     45:   PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY));
     46:   PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY));
     47:   PetscCall(MatCreateVecs(B,&t,NULL));

     49:   /* Create BV object X */
     50:   PetscCall(BVCreate(PETSC_COMM_WORLD,&X));
     51:   PetscCall(PetscObjectSetName((PetscObject)X,"X"));
     52:   PetscCall(BVSetSizesFromVec(X,t,k));
     53:   PetscCall(BVSetFromOptions(X));
     54:   PetscCall(BVSetMatrix(X,B,PETSC_FALSE));

     56:   /* Set up viewer */
     57:   PetscCall(PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&view));
     58:   if (verbose) PetscCall(PetscViewerPushFormat(view,PETSC_VIEWER_ASCII_MATLAB));

     60:   /* Fill X entries */
     61:   for (j=0;j<k;j++) {
     62:     PetscCall(BVGetColumn(X,j,&v));
     63:     PetscCall(VecSet(v,0.0));
     64:     for (i=0;i<4;i++) {
     65:       if (i+j<n) PetscCall(VecSetValue(v,i+j,(PetscScalar)(3*i+j-2),INSERT_VALUES));
     66:     }
     67:     PetscCall(VecAssemblyBegin(v));
     68:     PetscCall(VecAssemblyEnd(v));
     69:     PetscCall(BVRestoreColumn(X,j,&v));
     70:   }
     71:   if (verbose) {
     72:     PetscCall(MatView(B,view));
     73:     PetscCall(BVView(X,view));
     74:   }

     76:   /* Test BVNormColumn */
     77:   PetscCall(BVNormColumn(X,0,NORM_2,&nrm));
     78:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"B-Norm of X[0] = %g\n",(double)nrm));

     80:   /* Test BVOrthogonalizeColumn */
     81:   for (j=0;j<k;j++) {
     82:     PetscCall(BVOrthogonalizeColumn(X,j,NULL,&nrm,NULL));
     83:     alpha = 1.0/nrm;
     84:     PetscCall(BVScaleColumn(X,j,alpha));
     85:   }
     86:   if (verbose) PetscCall(BVView(X,view));

     88:   /* Check orthogonality */
     89:   PetscCall(MatCreateSeqDense(PETSC_COMM_SELF,k,k,NULL,&M));
     90:   PetscCall(BVDot(X,X,M));
     91:   PetscCall(MatShift(M,-1.0));
     92:   PetscCall(MatNorm(M,NORM_1,&nrm));
     93:   if (nrm<100*PETSC_MACHINE_EPSILON) PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Level of orthogonality < 100*eps\n"));
     94:   else PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Level of orthogonality: %g\n",(double)nrm));

     96:   /* Test BVNormVecBegin/End */
     97:   PetscCall(BVGetColumn(X,0,&v));
     98:   PetscCall(BVNormVecBegin(X,v,NORM_1,&nrm));
     99:   PetscCall(BVNormVecEnd(X,v,NORM_1,&nrm));
    100:   PetscCall(BVRestoreColumn(X,0,&v));
    101:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"B-Norm of X[0] = %g\n",(double)nrm));

    103:   PetscCall(BVDestroy(&X));
    104:   PetscCall(MatDestroy(&M));
    105:   PetscCall(MatDestroy(&B));
    106:   PetscCall(VecDestroy(&t));
    107:   PetscCall(SlepcFinalize());
    108:   return 0;
    109: }

    111: /*TEST

    113:    testset:
    114:       output_file: output/test3_1.out
    115:       test:
    116:          suffix: 1
    117:          args: -bv_type {{vecs contiguous svec mat}shared output}
    118:       test:
    119:          suffix: 1_svec_vecs
    120:          args: -bv_type svec -bv_matmult vecs
    121:       test:
    122:          suffix: 1_cuda
    123:          args: -bv_type {{svec mat}} -mat_type aijcusparse
    124:          requires: cuda
    125:       test:
    126:          suffix: 1_hip
    127:          args: -bv_type {{svec mat}} -mat_type aijhipsparse
    128:          requires: hip
    129:       test:
    130:          suffix: 2
    131:          nsize: 2
    132:          args: -bv_type {{vecs contiguous svec mat}shared output}
    133:       test:
    134:          suffix: 3
    135:          nsize: 2
    136:          args: -bv_type {{vecs contiguous svec mat}shared output} -bv_orthog_type mgs

    138: TEST*/