Date: 2015-09-03T15:04:16+00:00

Actual source code: test10.c
slepc-3.6.1 2015-09-03
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-2015, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.

      8:    SLEPc is free software: you can redistribute it and/or modify it under  the
      9:    terms of version 3 of the GNU Lesser General Public License as published by
     10:    the Free Software Foundation.

     12:    SLEPc  is  distributed in the hope that it will be useful, but WITHOUT  ANY
     13:    WARRANTY;  without even the implied warranty of MERCHANTABILITY or  FITNESS
     14:    FOR  A  PARTICULAR PURPOSE. See the GNU Lesser General Public  License  for
     15:    more details.

     17:    You  should have received a copy of the GNU Lesser General  Public  License
     18:    along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
     19:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     20: */

     22: static char help[] = "Test split reductions in BV.\n\n";

     24: #include <slepcbv.h>

     28: int main(int argc,char **argv)
     29: {
     31:   Vec            t,v,w,y,z,zsplit;
     32:   BV             X;
     33:   PetscInt       i,j,n=10,k=5;
     34:   PetscScalar    *zarray;
     35:   PetscReal      nrm;

     37:   SlepcInitialize(&argc,&argv,(char*)0,help);
     38:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
     39:   PetscOptionsGetInt(NULL,"-k",&k,NULL);
     40:   if (k<3) SETERRQ(PETSC_COMM_SELF,1,"Should specify at least k=3 columns");
     41:   PetscPrintf(PETSC_COMM_WORLD,"BV split ops (%D columns of dimension %D).\n",k,n);

     43:   /* Create template vector */
     44:   VecCreate(PETSC_COMM_WORLD,&t);
     45:   VecSetSizes(t,PETSC_DECIDE,n);
     46:   VecSetFromOptions(t);
     47:   VecDuplicate(t,&v);
     48:   VecSet(v,1.0);

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

     56:   /* Fill X entries */
     57:   for (j=0;j<k;j++) {
     58:     BVGetColumn(X,j,&w);
     59:     VecZeroEntries(w);
     60:     for (i=0;i<4;i++) {
     61:       if (i+j<n) {
     62:         VecSetValue(w,i+j,(PetscScalar)(3*i+j-2),INSERT_VALUES);
     63:       }
     64:     }
     65:     VecAssemblyBegin(w);
     66:     VecAssemblyEnd(w);
     67:     BVRestoreColumn(X,j,&w);
     68:   }

     70:   /* Use regular operations */
     71:   VecCreateSeq(PETSC_COMM_SELF,k+6,&z);
     72:   VecGetArray(z,&zarray);
     73:   BVGetColumn(X,0,&w);
     74:   VecDot(w,v,zarray);
     75:   BVRestoreColumn(X,0,&w);
     76:   BVDotVec(X,v,zarray+1);
     77:   BVDotColumn(X,2,zarray+1+k);

     79:   BVGetColumn(X,1,&y);
     80:   VecNorm(y,NORM_2,&nrm);
     81:   BVRestoreColumn(X,1,&y);
     82:   zarray[k+3] = nrm;
     83:   BVNormVec(X,v,NORM_2,&nrm);
     84:   zarray[k+4] = nrm;
     85:   BVNormColumn(X,0,NORM_2,&nrm);
     86:   zarray[k+5] = nrm;
     87:   VecRestoreArray(z,&zarray);

     89:   /* Use split operations */
     90:   VecCreateSeq(PETSC_COMM_SELF,k+6,&zsplit);
     91:   VecGetArray(zsplit,&zarray);
     92:   BVGetColumn(X,0,&w);
     93:   VecDotBegin(w,v,zarray);
     94:   BVDotVecBegin(X,v,zarray+1);
     95:   BVDotColumnBegin(X,2,zarray+1+k);
     96:   VecDotEnd(w,v,zarray);
     97:   BVRestoreColumn(X,0,&w);
     98:   BVDotVecEnd(X,v,zarray+1);
     99:   BVDotColumnEnd(X,2,zarray+1+k);

    101:   BVGetColumn(X,1,&y);
    102:   VecNormBegin(y,NORM_2,&nrm);
    103:   BVNormVecBegin(X,v,NORM_2,&nrm);
    104:   BVNormColumnBegin(X,0,NORM_2,&nrm);
    105:   VecNormEnd(y,NORM_2,&nrm);
    106:   BVRestoreColumn(X,1,&y);
    107:   zarray[k+3] = nrm;
    108:   BVNormVecEnd(X,v,NORM_2,&nrm);
    109:   zarray[k+4] = nrm;
    110:   BVNormColumnEnd(X,0,NORM_2,&nrm);
    111:   zarray[k+5] = nrm;
    112:   VecRestoreArray(zsplit,&zarray);

    114:   /* Show difference */
    115:   VecAXPY(z,-1.0,zsplit);
    116:   VecNorm(z,NORM_1,&nrm);
    117:   PetscSynchronizedPrintf(PETSC_COMM_WORLD,"%g\n",(double)nrm);
    118:   PetscSynchronizedFlush(PETSC_COMM_WORLD,NULL);

    120:   BVDestroy(&X);
    121:   VecDestroy(&t);
    122:   VecDestroy(&v);
    123:   VecDestroy(&z);
    124:   VecDestroy(&zsplit);
    125:   SlepcFinalize();
    126:   return 0;
    127: }