Actual source code: test14.c

slepc-3.5.0 2014-07-29
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  1: /*
  2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  4:    Copyright (c) 2002-2014, 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 EPS interface functions.\n\n";

 24: #include <slepceps.h>

 28: int main(int argc,char **argv)
 29: {
 30:   Mat                A,B;         /* problem matrix */
 31:   EPS                eps;         /* eigenproblem solver context */
 32:   ST                 st;
 33:   DS                 ds;
 34:   PetscReal          cut,tol;
 35:   PetscScalar        target;
 36:   PetscInt           n=20,i,its,nev,ncv,mpd,Istart,Iend;
 37:   PetscBool          flg;
 38:   EPSConvergedReason reason;
 39:   EPSType            type;
 40:   EPSExtraction      extr;
 41:   EPSBalance         bal;
 42:   EPSWhich           which;
 43:   EPSConv            conv;
 44:   EPSProblemType     ptype;
 45:   PetscErrorCode     ierr;

 47:   SlepcInitialize(&argc,&argv,(char*)0,help);
 48:   PetscPrintf(PETSC_COMM_WORLD,"\nDiagonal Eigenproblem, n=%D\n\n",n);

 50:   MatCreate(PETSC_COMM_WORLD,&A);
 51:   MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);
 52:   MatSetFromOptions(A);
 53:   MatSetUp(A);
 54:   MatGetOwnershipRange(A,&Istart,&Iend);
 55:   for (i=Istart;i<Iend;i++) {
 56:     MatSetValue(A,i,i,i+1,INSERT_VALUES);
 57:   }
 58:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 59:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

 61:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 62:              Create eigensolver and test interface functions
 63:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 64:   EPSCreate(PETSC_COMM_WORLD,&eps);
 65:   EPSSetOperators(eps,A,NULL);
 66:   EPSGetOperators(eps,&B,NULL);
 67:   MatView(B,NULL);

 69:   EPSSetType(eps,EPSKRYLOVSCHUR);
 70:   EPSGetType(eps,&type);
 71:   PetscPrintf(PETSC_COMM_WORLD," Type set to %s\n",type);

 73:   EPSGetProblemType(eps,&ptype);
 74:   PetscPrintf(PETSC_COMM_WORLD," Problem type before changing = %D",ptype);
 75:   EPSSetProblemType(eps,EPS_HEP);
 76:   EPSGetProblemType(eps,&ptype);
 77:   PetscPrintf(PETSC_COMM_WORLD," ... changed to %D.",ptype);
 78:   EPSIsGeneralized(eps,&flg);
 79:   if (flg) { PetscPrintf(PETSC_COMM_WORLD," generalized"); }
 80:   EPSIsHermitian(eps,&flg);
 81:   if (flg) { PetscPrintf(PETSC_COMM_WORLD," hermitian"); }
 82:   EPSIsPositive(eps,&flg);
 83:   if (flg) { PetscPrintf(PETSC_COMM_WORLD," positive"); }

 85:   EPSGetExtraction(eps,&extr);
 86:   PetscPrintf(PETSC_COMM_WORLD,"\n Extraction before changing = %D",extr);
 87:   EPSSetExtraction(eps,EPS_HARMONIC);
 88:   EPSGetExtraction(eps,&extr);
 89:   PetscPrintf(PETSC_COMM_WORLD," ... changed to %D\n",extr);

 91:   EPSSetBalance(eps,EPS_BALANCE_ONESIDE,8,1e-6);
 92:   EPSGetBalance(eps,&bal,&its,&cut);
 93:   PetscPrintf(PETSC_COMM_WORLD," Balance: %s, its=%D, cutoff=%g\n",EPSBalanceTypes[bal],its,(double)cut);

 95:   EPSSetTarget(eps,4.8);
 96:   EPSGetTarget(eps,&target);
 97:   EPSSetWhichEigenpairs(eps,EPS_TARGET_MAGNITUDE);
 98:   EPSGetWhichEigenpairs(eps,&which);
 99:   PetscPrintf(PETSC_COMM_WORLD," Which = %D, target = %g\n",which,(double)PetscRealPart(target));

101:   EPSSetDimensions(eps,4,PETSC_DEFAULT,PETSC_DEFAULT);
102:   EPSGetDimensions(eps,&nev,&ncv,&mpd);
103:   PetscPrintf(PETSC_COMM_WORLD," Dimensions: nev=%D, ncv=%D, mpd=%D\n",nev,ncv,mpd);

105:   EPSSetTolerances(eps,2.2e-4,200);
106:   EPSGetTolerances(eps,&tol,&its);
107:   PetscPrintf(PETSC_COMM_WORLD," Tolerance = %.5f, max_its = %D\n",(double)tol,its);

109:   EPSSetConvergenceTest(eps,EPS_CONV_ABS);
110:   EPSGetConvergenceTest(eps,&conv);
111:   PetscPrintf(PETSC_COMM_WORLD," Convergence test = %D\n",conv);

113:   EPSMonitorSet(eps,EPSMonitorFirst,NULL,NULL);
114:   EPSMonitorCancel(eps);

116:   EPSGetST(eps,&st);
117:   STView(st,NULL);
118:   EPSGetDS(eps,&ds);
119:   DSView(ds,NULL);

121:   EPSSetFromOptions(eps);
122:   EPSSolve(eps);
123:   EPSGetConvergedReason(eps,&reason);
124:   EPSGetIterationNumber(eps,&its);
125:   PetscPrintf(PETSC_COMM_WORLD," Finished - converged reason = %D, its=%D\n",reason,its);

127:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
128:                     Display solution and clean up
129:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
130:   EPSPrintSolution(eps,NULL);
131:   EPSDestroy(&eps);
132:   MatDestroy(&A);
133:   SlepcFinalize();
134:   return 0;
135: }