Date: 2022-11-02T11:46:27+00:00

Actual source code: test6.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 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;

     27:   SlepcInitialize(&argc,&argv,(char*)0,help);
     28:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
     29:   PetscOptionsGetInt(NULL,NULL,"-k",&k,NULL);
     30:   PetscOptionsGetInt(NULL,NULL,"-nc",&nc,NULL);
     31:   PetscOptionsHasName(NULL,NULL,"-verbose",&verbose);
     32:   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:   VecCreate(PETSC_COMM_WORLD,&t);
     36:   VecSetSizes(t,PETSC_DECIDE,n);
     37:   VecSetFromOptions(t);
     38:   VecGetLocalSize(t,&nloc);

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

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

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

     62:   /* Fill X entries */
     63:   for (j=0;j<k;j++) {
     64:     BVGetColumn(X,j,&v);
     65:     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:         VecSetValue(v,i+j,alpha,INSERT_VALUES);
     70:       }
     71:     }
     72:     VecAssemblyBegin(v);
     73:     VecAssemblyEnd(v);
     74:     BVRestoreColumn(X,j,&v);
     75:   }
     76:   if (verbose) BVView(X,view);

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

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

     94:   MatDestroy(&M);
     95:   BVDestroy(&X);
     96:   VecDestroy(&t);
     97:   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 -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 -vec_type cuda -bv_orthog_type mgs
    122:          requires: cuda

    124: TEST*/