Date: 2021-02-01T14:42:00+00:00

Actual source code: test14.c
slepc-3.14.2 2021-02-01
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-2020, Universitat Politecnica de Valencia, Spain

      6:    This file is part of SLEPc.
      7:    SLEPc is distributed under a 2-clause BSD license (see LICENSE).
      8:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      9: */

     11: static char help[] = "Test EPS interface functions.\n\n";

     13: #include <slepceps.h>

     15: int main(int argc,char **argv)
     16: {
     17:   Mat                A,B;         /* problem matrix */
     18:   EPS                eps;         /* eigenproblem solver context */
     19:   ST                 st;
     20:   KSP                ksp;
     21:   DS                 ds;
     22:   PetscReal          cut,tol;
     23:   PetscScalar        target;
     24:   PetscInt           n=20,i,its,nev,ncv,mpd,Istart,Iend;
     25:   PetscBool          flg,pur,track;
     26:   EPSConvergedReason reason;
     27:   EPSType            type;
     28:   EPSExtraction      extr;
     29:   EPSBalance         bal;
     30:   EPSWhich           which;
     31:   EPSConv            conv;
     32:   EPSStop            stop;
     33:   EPSProblemType     ptype;
     34:   PetscErrorCode     ierr;
     35:   PetscViewerAndFormat *vf;

     37:   SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
     38:   PetscPrintf(PETSC_COMM_WORLD,"\nDiagonal Eigenproblem, n=%D\n\n",n);

     40:   MatCreate(PETSC_COMM_WORLD,&A);
     41:   MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);
     42:   MatSetFromOptions(A);
     43:   MatSetUp(A);
     44:   MatGetOwnershipRange(A,&Istart,&Iend);
     45:   for (i=Istart;i<Iend;i++) {
     46:     MatSetValue(A,i,i,i+1,INSERT_VALUES);
     47:   }
     48:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
     49:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

     51:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     52:              Create eigensolver and test interface functions
     53:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     54:   EPSCreate(PETSC_COMM_WORLD,&eps);
     55:   EPSSetOperators(eps,A,NULL);
     56:   EPSGetOperators(eps,&B,NULL);
     57:   MatView(B,NULL);

     59:   EPSSetType(eps,EPSKRYLOVSCHUR);
     60:   EPSGetType(eps,&type);
     61:   PetscPrintf(PETSC_COMM_WORLD," Type set to %s\n",type);

     63:   EPSGetProblemType(eps,&ptype);
     64:   PetscPrintf(PETSC_COMM_WORLD," Problem type before changing = %d",(int)ptype);
     65:   EPSSetProblemType(eps,EPS_HEP);
     66:   EPSGetProblemType(eps,&ptype);
     67:   PetscPrintf(PETSC_COMM_WORLD," ... changed to %d.",(int)ptype);
     68:   EPSIsGeneralized(eps,&flg);
     69:   if (flg) { PetscPrintf(PETSC_COMM_WORLD," generalized"); }
     70:   EPSIsHermitian(eps,&flg);
     71:   if (flg) { PetscPrintf(PETSC_COMM_WORLD," hermitian"); }
     72:   EPSIsPositive(eps,&flg);
     73:   if (flg) { PetscPrintf(PETSC_COMM_WORLD," positive"); }

     75:   EPSGetExtraction(eps,&extr);
     76:   PetscPrintf(PETSC_COMM_WORLD,"\n Extraction before changing = %d",(int)extr);
     77:   EPSSetExtraction(eps,EPS_HARMONIC);
     78:   EPSGetExtraction(eps,&extr);
     79:   PetscPrintf(PETSC_COMM_WORLD," ... changed to %d\n",(int)extr);

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

     85:   EPSSetPurify(eps,PETSC_FALSE);
     86:   EPSGetPurify(eps,&pur);
     87:   PetscPrintf(PETSC_COMM_WORLD," Eigenvector purification: %s\n",pur?"on":"off");
     88:   EPSGetTrackAll(eps,&track);

     90:   EPSSetTarget(eps,4.8);
     91:   EPSGetTarget(eps,&target);
     92:   EPSSetWhichEigenpairs(eps,EPS_TARGET_MAGNITUDE);
     93:   EPSGetWhichEigenpairs(eps,&which);
     94:   PetscPrintf(PETSC_COMM_WORLD," Which = %d, target = %g\n",(int)which,(double)PetscRealPart(target));

     96:   EPSSetDimensions(eps,4,PETSC_DEFAULT,PETSC_DEFAULT);
     97:   EPSGetDimensions(eps,&nev,&ncv,&mpd);
     98:   PetscPrintf(PETSC_COMM_WORLD," Dimensions: nev=%D, ncv=%D, mpd=%D\n",nev,ncv,mpd);

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

    104:   EPSSetConvergenceTest(eps,EPS_CONV_ABS);
    105:   EPSGetConvergenceTest(eps,&conv);
    106:   EPSSetStoppingTest(eps,EPS_STOP_BASIC);
    107:   EPSGetStoppingTest(eps,&stop);
    108:   PetscPrintf(PETSC_COMM_WORLD," Convergence test = %d, stopping test = %d\n",(int)conv,(int)stop);

    110:   PetscViewerAndFormatCreate(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_DEFAULT,&vf);
    111:   EPSMonitorSet(eps,(PetscErrorCode (*)(EPS,PetscInt,PetscInt,PetscScalar*,PetscScalar*,PetscReal*,PetscInt,void*))EPSMonitorFirst,vf,(PetscErrorCode (*)(void**))PetscViewerAndFormatDestroy);
    112:   EPSMonitorCancel(eps);

    114:   EPSGetST(eps,&st);
    115:   STGetKSP(st,&ksp);
    116:   KSPSetTolerances(ksp,1e-8,1e-35,PETSC_DEFAULT,PETSC_DEFAULT);
    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",(int)reason,its);

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

    137: /*TEST

    139:    test:
    140:       suffix: 1
    141:       args: -eps_ncv 14
    142:       filter: sed -e "s/00001/00000/"

    144: TEST*/