Date: 2015-09-03T15:05:03+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[] = "Tests multiple calls to EPSSolve with different matrix.\n\n";

     24: #include <slepceps.h>

     28: int main(int argc,char **argv)
     29: {
     30:   Mat            A1,A2;       /* problem matrices */
     31:   EPS            eps;         /* eigenproblem solver context */
     32:   PetscReal      tol=1000*PETSC_MACHINE_EPSILON,v;
     33:   Vec            d;
     34:   PetscInt       n=30,i,Istart,Iend;
     35:   PetscRandom    myrand;

     38:   SlepcInitialize(&argc,&argv,(char*)0,help);

     40:   PetscOptionsGetInt(NULL,"-n",&n,NULL);
     41:   PetscPrintf(PETSC_COMM_WORLD,"\nTridiagonal with random diagonal, n=%D\n\n",n);

     43:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     44:            Create matrix tridiag([-1 0 -1])
     45:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     46:   MatCreate(PETSC_COMM_WORLD,&A1);
     47:   MatSetSizes(A1,PETSC_DECIDE,PETSC_DECIDE,n,n);
     48:   MatSetFromOptions(A1);
     49:   MatSetUp(A1);

     51:   MatGetOwnershipRange(A1,&Istart,&Iend);
     52:   for (i=Istart;i<Iend;i++) {
     53:     if (i>0) { MatSetValue(A1,i,i-1,-1.0,INSERT_VALUES); }
     54:     if (i<n-1) { MatSetValue(A1,i,i+1,-1.0,INSERT_VALUES); }
     55:   }
     56:   MatAssemblyBegin(A1,MAT_FINAL_ASSEMBLY);
     57:   MatAssemblyEnd(A1,MAT_FINAL_ASSEMBLY);

     59:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     60:        Create two matrices by filling the diagonal with rand values
     61:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     62:   MatDuplicate(A1,MAT_COPY_VALUES,&A2);
     63:   MatCreateVecs(A1,NULL,&d);
     64:   PetscRandomCreate(PETSC_COMM_WORLD,&myrand);
     65:   PetscRandomSetFromOptions(myrand);
     66:   PetscRandomSetInterval(myrand,0.0,1.0);
     67:   for (i=Istart;i<Iend;i++) {
     68:     PetscRandomGetValueReal(myrand,&v);
     69:     VecSetValue(d,i,v,INSERT_VALUES);
     70:   }
     71:   VecAssemblyBegin(d);
     72:   VecAssemblyEnd(d);
     73:   MatDiagonalSet(A1,d,INSERT_VALUES);
     74:   for (i=Istart;i<Iend;i++) {
     75:     PetscRandomGetValueReal(myrand,&v);
     76:     VecSetValue(d,i,v,INSERT_VALUES);
     77:   }
     78:   VecAssemblyBegin(d);
     79:   VecAssemblyEnd(d);
     80:   MatDiagonalSet(A2,d,INSERT_VALUES);
     81:   VecDestroy(&d);
     82:   PetscRandomDestroy(&myrand);

     84:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     85:                         Create the eigensolver
     86:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     87:   EPSCreate(PETSC_COMM_WORLD,&eps);
     88:   EPSSetProblemType(eps,EPS_HEP);
     89:   EPSSetTolerances(eps,tol,PETSC_DEFAULT);
     90:   EPSSetOperators(eps,A1,NULL);
     91:   EPSSetFromOptions(eps);

     93:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     94:                         Solve first eigenproblem
     95:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     96:   EPSSolve(eps);
     97:   PetscPrintf(PETSC_COMM_WORLD," - - - First matrix - - -\n");
     98:   EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);

    100:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    101:                         Solve second eigenproblem
    102:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
    103:   EPSSetOperators(eps,A2,NULL);
    104:   EPSSolve(eps);
    105:   PetscPrintf(PETSC_COMM_WORLD," - - - Second matrix - - -\n");
    106:   EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);

    108:   EPSDestroy(&eps);
    109:   MatDestroy(&A1);
    110:   MatDestroy(&A2);
    111:   SlepcFinalize();
    112:   return 0;
    113: }