Date: 2015-09-03T15:03:44+00:00

Actual source code: test3.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 DSHEP with compact storage.\n\n";

     24: #include <slepcds.h>

     28: int main(int argc,char **argv)
     29: {
     31:   DS             ds;
     32:   SlepcSC        sc;
     33:   PetscReal      *T;
     34:   PetscScalar    *eig;
     35:   PetscInt       i,n=10,l=2,k=5,ld;
     36:   PetscViewer    viewer;
     37:   PetscBool      verbose,extrarow;

     39:   SlepcInitialize(&argc,&argv,(char*)0,help);
     40:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
     41:   PetscPrintf(PETSC_COMM_WORLD,"Solve a Dense System of type HEP with compact storage - dimension %D.\n",n);
     42:   PetscOptionsGetInt(NULL,"-l",&l,NULL);
     43:   PetscOptionsGetInt(NULL,"-k",&k,NULL);
     44:   if (l>n || k>n || l>k) SETERRQ(PETSC_COMM_WORLD,1,"Wrong value of dimensions");
     45:   PetscOptionsHasName(NULL,"-verbose",&verbose);
     46:   PetscOptionsHasName(NULL,"-extrarow",&extrarow);

     48:   /* Create DS object */
     49:   DSCreate(PETSC_COMM_WORLD,&ds);
     50:   DSSetType(ds,DSHEP);
     51:   DSSetFromOptions(ds);
     52:   ld = n+2;  /* test leading dimension larger than n */
     53:   DSAllocate(ds,ld);
     54:   DSSetDimensions(ds,n,0,l,k);
     55:   DSSetCompact(ds,PETSC_TRUE);
     56:   DSSetExtraRow(ds,extrarow);

     58:   /* Set up viewer */
     59:   PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&viewer);
     60:   PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_INFO_DETAIL);
     61:   DSView(ds,viewer);
     62:   PetscViewerPopFormat(viewer);
     63:   if (verbose) {
     64:     PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_MATLAB);
     65:   }

     67:   /* Fill arrow-tridiagonal matrix */
     68:   DSGetArrayReal(ds,DS_MAT_T,&T);
     69:   for (i=0;i<n;i++) T[i] = (PetscReal)(i+1);
     70:   for (i=l;i<n-1;i++) T[i+ld] = 1.0;
     71:   if (extrarow) T[n-1+ld] = 1.0;
     72:   DSRestoreArrayReal(ds,DS_MAT_T,&T);
     73:   if (l==0 && k==0) {
     74:     DSSetState(ds,DS_STATE_INTERMEDIATE);
     75:   } else {
     76:     DSSetState(ds,DS_STATE_RAW);
     77:   }
     78:   if (verbose) {
     79:     PetscPrintf(PETSC_COMM_WORLD,"Initial - - - - - - - - -\n");
     80:     DSView(ds,viewer);
     81:   }

     83:   /* Solve */
     84:   PetscMalloc1(n,&eig);
     85:   DSGetSlepcSC(ds,&sc);
     86:   sc->comparison    = SlepcCompareLargestMagnitude;
     87:   sc->comparisonctx = NULL;
     88:   sc->map           = NULL;
     89:   sc->mapobj        = NULL;
     90:   DSSolve(ds,eig,NULL);
     91:   DSSort(ds,eig,NULL,NULL,NULL,NULL);
     92:   if (extrarow) { DSUpdateExtraRow(ds); }
     93:   if (verbose) {
     94:     PetscPrintf(PETSC_COMM_WORLD,"After solve - - - - - - - - -\n");
     95:     DSView(ds,viewer);
     96:   }

     98:   /* Print eigenvalues */
     99:   PetscPrintf(PETSC_COMM_WORLD,"Computed eigenvalues =\n");
    100:   for (i=0;i<n;i++) {
    101:     PetscViewerASCIIPrintf(viewer,"  %.5f\n",(double)PetscRealPart(eig[i]));
    102:   }

    104:   PetscFree(eig);
    105:   DSDestroy(&ds);
    106:   SlepcFinalize();
    107:   return 0;
    108: }