Date: 2024-09-25T09:34:30+00:00

Actual source code: test17.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 bi-orthogonalization functions.\n\n";

     13: #include <slepcbv.h>

     15: int main(int argc,char **argv)
     16: {
     17:   BV             X,Y;
     18:   Mat            M;
     19:   Vec            v,t;
     20:   PetscInt       i,j,n=20,k=7;
     21:   PetscViewer    view;
     22:   PetscBool      verbose;
     23:   PetscReal      norm,condn=1.0;
     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(PetscOptionsGetReal(NULL,NULL,"-condn",&condn,NULL));
     31:   PetscCheck(condn>=1.0,PETSC_COMM_WORLD,PETSC_ERR_USER_INPUT,"The condition number must be > 1");
     32:   PetscCall(PetscOptionsHasName(NULL,NULL,"-verbose",&verbose));
     33:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Test BV bi-orthogonalization with %" PetscInt_FMT " columns of length %" PetscInt_FMT ".\n",k,n));
     34:   if (condn>1.0) PetscCall(PetscPrintf(PETSC_COMM_WORLD," - Using random BVs with condition number = %g\n",(double)condn));

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

     41:   /* Create BV object X */
     42:   PetscCall(BVCreate(PETSC_COMM_WORLD,&X));
     43:   PetscCall(PetscObjectSetName((PetscObject)X,"X"));
     44:   PetscCall(BVSetSizesFromVec(X,t,k));
     45:   PetscCall(BVSetFromOptions(X));

     47:   /* Set up viewer */
     48:   PetscCall(PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&view));
     49:   if (verbose) PetscCall(PetscViewerPushFormat(view,PETSC_VIEWER_ASCII_MATLAB));

     51:   /* Fill X entries */
     52:   if (condn==1.0) {
     53:     for (j=0;j<k;j++) {
     54:       PetscCall(BVGetColumn(X,j,&v));
     55:       PetscCall(VecSet(v,0.0));
     56:       for (i=0;i<=n/2;i++) {
     57:         if (i+j<n) {
     58:           alpha = (3.0*i+j-2)/(2*(i+j+1));
     59: #if defined(PETSC_USE_COMPLEX)
     60:           alpha += (1.2*i+j-2)/(0.1*(i+j+1))*PETSC_i;
     61: #endif
     62:           PetscCall(VecSetValue(v,i+j,alpha,INSERT_VALUES));
     63:         }
     64:       }
     65:       PetscCall(VecAssemblyBegin(v));
     66:       PetscCall(VecAssemblyEnd(v));
     67:       PetscCall(BVRestoreColumn(X,j,&v));
     68:     }
     69:   } else PetscCall(BVSetRandomCond(X,condn));
     70:   if (verbose) PetscCall(BVView(X,view));

     72:   /* Create Y and fill its entries */
     73:   PetscCall(BVDuplicate(X,&Y));
     74:   PetscCall(PetscObjectSetName((PetscObject)Y,"Y"));
     75:   if (condn==1.0) {
     76:     for (j=0;j<k;j++) {
     77:       PetscCall(BVGetColumn(Y,j,&v));
     78:       PetscCall(VecSet(v,0.0));
     79:       for (i=PetscMin(n,2+(2*j)%6);i<PetscMin(n,6+(3*j)%9);i++) {
     80:         if (i%5 && i!=j) {
     81:           alpha = (1.5*i+j)/(2.2*(i-j));
     82:           PetscCall(VecSetValue(v,i+j,alpha,INSERT_VALUES));
     83:         }
     84:       }
     85:       PetscCall(VecAssemblyBegin(v));
     86:       PetscCall(VecAssemblyEnd(v));
     87:       PetscCall(BVRestoreColumn(Y,j,&v));
     88:     }
     89:   } else PetscCall(BVSetRandomCond(Y,condn));
     90:   if (verbose) PetscCall(BVView(Y,view));

     92:   /* Test BVBiorthonormalizeColumn */
     93:   for (j=0;j<k;j++) PetscCall(BVBiorthonormalizeColumn(X,Y,j,NULL));
     94:   if (verbose) {
     95:     PetscCall(BVView(X,view));
     96:     PetscCall(BVView(Y,view));
     97:   }

     99:   /* Check orthogonality */
    100:   PetscCall(MatCreateSeqDense(PETSC_COMM_SELF,k,k,NULL,&M));
    101:   PetscCall(PetscObjectSetName((PetscObject)M,"M"));
    102:   PetscCall(BVDot(X,Y,M));
    103:   if (verbose) PetscCall(MatView(M,view));
    104:   PetscCall(MatShift(M,-1.0));
    105:   PetscCall(MatNorm(M,NORM_1,&norm));
    106:   if (norm<200*PETSC_MACHINE_EPSILON) PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Level of bi-orthogonality < 200*eps\n"));
    107:   else PetscCall(PetscPrintf(PETSC_COMM_WORLD,"Level of bi-orthogonality: %g\n",(double)norm));

    109:   PetscCall(MatDestroy(&M));
    110:   PetscCall(BVDestroy(&X));
    111:   PetscCall(BVDestroy(&Y));
    112:   PetscCall(VecDestroy(&t));
    113:   PetscCall(SlepcFinalize());
    114:   return 0;
    115: }

    117: /*TEST

    119:    testset:
    120:       output_file: output/test17_1.out
    121:       test:
    122:          suffix: 1
    123:          args: -bv_type {{vecs contiguous svec mat}} -bv_orthog_type cgs
    124:          requires: double
    125:       test:
    126:          suffix: 1_cuda
    127:          args: -bv_type {{svec mat}} -vec_type cuda -bv_orthog_type cgs
    128:          requires: cuda
    129:       test:
    130:          suffix: 2
    131:          args: -bv_type {{vecs contiguous svec mat}} -bv_orthog_type mgs
    132:       test:
    133:          suffix: 2_cuda
    134:          args: -bv_type {{svec mat}} -vec_type cuda -bv_orthog_type mgs
    135:          requires: cuda

    137: TEST*/