Date: 2024-09-25T09:34:29+00:00

Actual source code: test6.c
slepc-3.21.2 2024-09-25
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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 BV orthogonalization functions with constraints.\n\n";

     13: #include <slepcbv.h>

     15: int main(int argc,char **argv)
     16: {
     17:   BV             X;
     18:   Mat            M;
     19:   Vec            v,t,*C;
     20:   PetscInt       i,j,n=20,k=8,nc=2,nloc;
     21:   PetscViewer    view;
     22:   PetscBool      verbose;
     23:   PetscReal      norm;
     24:   PetscScalar    alpha;

     26:   PetscFunctionBeginUser;
     27:   PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
     28:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
     29:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-k",&k,NULL));
     30:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-nc",&nc,NULL));
     31:   PetscCall(PetscOptionsHasName(NULL,NULL,"-verbose",&verbose));
     32:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Test BV orthogonalization with %" PetscInt_FMT " columns + %" PetscInt_FMT " constraints, of length %" PetscInt_FMT ".\n",k,nc,n));

     34:   /* Create template vector */
     35:   PetscCall(VecCreate(PETSC_COMM_WORLD,&t));
     36:   PetscCall(VecSetSizes(t,PETSC_DECIDE,n));
     37:   PetscCall(VecSetFromOptions(t));
     38:   PetscCall(VecGetLocalSize(t,&nloc));

     40:   /* Create BV object X */
     41:   PetscCall(BVCreate(PETSC_COMM_WORLD,&X));
     42:   PetscCall(PetscObjectSetName((PetscObject)X,"X"));
     43:   PetscCall(BVSetSizes(X,nloc,n,k));
     44:   PetscCall(BVSetFromOptions(X));

     46:   /* Generate constraints and attach them to X */
     47:   if (nc>0) {
     48:     PetscCall(VecDuplicateVecs(t,nc,&C));
     49:     for (j=0;j<nc;j++) {
     50:       for (i=0;i<=j;i++) PetscCall(VecSetValue(C[j],i,1.0,INSERT_VALUES));
     51:       PetscCall(VecAssemblyBegin(C[j]));
     52:       PetscCall(VecAssemblyEnd(C[j]));
     53:     }
     54:     PetscCall(BVInsertConstraints(X,&nc,C));
     55:     PetscCall(VecDestroyVecs(nc,&C));
     56:   }

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

     62:   /* Fill X entries */
     63:   for (j=0;j<k;j++) {
     64:     PetscCall(BVGetColumn(X,j,&v));
     65:     PetscCall(VecSet(v,0.0));
     66:     for (i=0;i<=n/2;i++) {
     67:       if (i+j<n) {
     68:         alpha = (3.0*i+j-2)/(2*(i+j+1));
     69:         PetscCall(VecSetValue(v,i+j,alpha,INSERT_VALUES));
     70:       }
     71:     }
     72:     PetscCall(VecAssemblyBegin(v));
     73:     PetscCall(VecAssemblyEnd(v));
     74:     PetscCall(BVRestoreColumn(X,j,&v));
     75:   }
     76:   if (verbose) PetscCall(BVView(X,view));

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

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

     94:   PetscCall(MatDestroy(&M));
     95:   PetscCall(BVDestroy(&X));
     96:   PetscCall(VecDestroy(&t));
     97:   PetscCall(SlepcFinalize());
     98:   return 0;
     99: }

    101: /*TEST

    103:    testset:
    104:       output_file: output/test6_1.out
    105:       test:
    106:          suffix: 1
    107:          args: -bv_type {{vecs contiguous svec mat}shared output}
    108:       test:
    109:          suffix: 1_cuda
    110:          args: -bv_type {{svec mat}} -vec_type cuda
    111:          requires: cuda
    112:       test:
    113:          suffix: 2
    114:          nsize: 2
    115:          args: -bv_type {{vecs contiguous svec mat}shared output}
    116:       test:
    117:          suffix: 3
    118:          args: -bv_type {{vecs contiguous svec mat}shared output} -bv_orthog_type mgs
    119:       test:
    120:          suffix: 3_cuda
    121:          args: -bv_type {{svec mat}} -vec_type cuda -bv_orthog_type mgs
    122:          requires: cuda

    124: TEST*/