Date: 2016-03-29T14:57:30+00:00

Actual source code: test1.c
slepc-3.6.3 2016-03-29
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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 BV operations.\n\n";

     24: #include <slepcbv.h>

     28: int main(int argc,char **argv)
     29: {
     31:   Vec            t,v;
     32:   Mat            Q,M;
     33:   BV             X,Y;
     34:   PetscInt       i,j,n=10,k=5,l=3;
     35:   PetscScalar    *q,*z;
     36:   PetscReal      nrm;
     37:   PetscViewer    view;
     38:   PetscBool      verbose;

     40:   SlepcInitialize(&argc,&argv,(char*)0,help);
     41:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
     42:   PetscOptionsGetInt(NULL,"-k",&k,NULL);
     43:   PetscOptionsGetInt(NULL,"-l",&l,NULL);
     44:   PetscOptionsHasName(NULL,"-verbose",&verbose);
     45:   PetscPrintf(PETSC_COMM_WORLD,"Test BV with %D columns of dimension %D.\n",k,n);

     47:   /* Create template vector */
     48:   VecCreate(PETSC_COMM_WORLD,&t);
     49:   VecSetSizes(t,PETSC_DECIDE,n);
     50:   VecSetFromOptions(t);

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

     58:   /* Set up viewer */
     59:   PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&view);
     60:   if (!verbose) {
     61:     PetscViewerPushFormat(view,PETSC_VIEWER_ASCII_INFO_DETAIL);
     62:     BVView(X,view);
     63:     PetscViewerPopFormat(view);
     64:   }

     66:   /* Fill X entries */
     67:   for (j=0;j<k;j++) {
     68:     BVGetColumn(X,j,&v);
     69:     VecSet(v,0.0);
     70:     for (i=0;i<4;i++) {
     71:       if (i+j<n) {
     72:         VecSetValue(v,i+j,(PetscScalar)(3*i+j-2),INSERT_VALUES);
     73:       }
     74:     }
     75:     VecAssemblyBegin(v);
     76:     VecAssemblyEnd(v);
     77:     BVRestoreColumn(X,j,&v);
     78:   }
     79:   if (verbose) {
     80:     BVView(X,view);
     81:   }

     83:   /* Create BV object Y */
     84:   BVCreate(PETSC_COMM_WORLD,&Y);
     85:   PetscObjectSetName((PetscObject)Y,"Y");
     86:   BVSetSizesFromVec(Y,t,l);
     87:   BVSetFromOptions(Y);

     89:   /* Fill Y entries */
     90:   for (j=0;j<l;j++) {
     91:     BVGetColumn(Y,j,&v);
     92:     VecSet(v,(PetscScalar)(j+1)/4.0);
     93:     BVRestoreColumn(Y,j,&v);
     94:   }
     95:   if (verbose) {
     96:     BVView(Y,view);
     97:   }

     99:   /* Create Mat */
    100:   MatCreateSeqDense(PETSC_COMM_SELF,k,l,NULL,&Q);
    101:   PetscObjectSetName((PetscObject)Q,"Q");
    102:   MatDenseGetArray(Q,&q);
    103:   for (i=0;i<k;i++)
    104:     for (j=0;j<l;j++)
    105:       q[i+j*k] = (i<j)? 2.0: -0.5;
    106:   MatDenseRestoreArray(Q,&q);
    107:   if (verbose) {
    108:     MatView(Q,NULL);
    109:   }

    111:   /* Test BVMult */
    112:   BVMult(Y,2.0,1.0,X,Q);
    113:   if (verbose) {
    114:     PetscPrintf(PETSC_COMM_WORLD,"After BVMult - - - - - - - - -\n");
    115:     BVView(Y,view);
    116:   }

    118:   /* Test BVMultVec */
    119:   BVGetColumn(Y,0,&v);
    120:   PetscMalloc1(k,&z);
    121:   z[0] = 2.0;
    122:   for (i=1;i<k;i++) z[i] = -0.5*z[i-1];
    123:   BVMultVec(X,-1.0,1.0,v,z);
    124:   PetscFree(z);
    125:   BVRestoreColumn(Y,0,&v);
    126:   if (verbose) {
    127:     PetscPrintf(PETSC_COMM_WORLD,"After BVMultVec - - - - - - -\n");
    128:     BVView(Y,view);
    129:   }

    131:   /* Test BVDot */
    132:   MatCreateSeqDense(PETSC_COMM_SELF,l,k,NULL,&M);
    133:   PetscObjectSetName((PetscObject)M,"M");
    134:   BVDot(X,Y,M);
    135:   if (verbose) {
    136:     PetscPrintf(PETSC_COMM_WORLD,"After BVDot - - - - - - - - -\n");
    137:     MatView(M,NULL);
    138:   }

    140:   /* Test BVDotVec */
    141:   BVGetColumn(Y,0,&v);
    142:   PetscMalloc1(k,&z);
    143:   BVDotVec(X,v,z);
    144:   BVRestoreColumn(Y,0,&v);
    145:   if (verbose) {
    146:     PetscPrintf(PETSC_COMM_WORLD,"After BVDotVec - - - - - - -\n");
    147:     VecCreateSeqWithArray(PETSC_COMM_SELF,1,k,z,&v);
    148:     PetscObjectSetName((PetscObject)v,"z");
    149:     VecView(v,view);
    150:     VecDestroy(&v);
    151:   }
    152:   PetscFree(z);

    154:   /* Test BVMultInPlace and BVScale */
    155:   BVMultInPlace(X,Q,1,l);
    156:   BVScale(X,2.0);
    157:   if (verbose) {
    158:     PetscPrintf(PETSC_COMM_WORLD,"After BVMultInPlace - - - - -\n");
    159:     BVView(X,view);
    160:   }

    162:   /* Test BVNorm */
    163:   BVNormColumn(X,0,NORM_2,&nrm);
    164:   PetscPrintf(PETSC_COMM_WORLD,"2-Norm or X[0] = %g\n",(double)nrm);
    165:   BVNorm(X,NORM_FROBENIUS,&nrm);
    166:   PetscPrintf(PETSC_COMM_WORLD,"Frobenius Norm or X = %g\n",(double)nrm);

    168:   BVDestroy(&X);
    169:   BVDestroy(&Y);
    170:   MatDestroy(&Q);
    171:   MatDestroy(&M);
    172:   VecDestroy(&t);
    173:   SlepcFinalize();
    174:   return 0;
    175: }