Date: 2022-11-02T11:46:56+00:00

Actual source code: test14.c
slepc-3.18.1 2022-11-02
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      1: /*
      2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
      3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
      4:    Copyright (c) 2002-, 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:   PetscViewerAndFormat *vf;

     37:   SlepcInitialize(&argc,&argv,(char*)0,help);
     38:   PetscPrintf(PETSC_COMM_WORLD,"\nDiagonal Eigenproblem, n=%" PetscInt_FMT "\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++) MatSetValue(A,i,i,i+1,INSERT_VALUES);
     46:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
     47:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);

     49:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     50:              Create eigensolver and test interface functions
     51:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     52:   EPSCreate(PETSC_COMM_WORLD,&eps);
     53:   EPSSetOperators(eps,A,NULL);
     54:   EPSGetOperators(eps,&B,NULL);
     55:   MatView(B,NULL);

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

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

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

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

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

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

     94:   EPSSetDimensions(eps,4,PETSC_DEFAULT,PETSC_DEFAULT);
     95:   EPSGetDimensions(eps,&nev,&ncv,&mpd);
     96:   PetscPrintf(PETSC_COMM_WORLD," Dimensions: nev=%" PetscInt_FMT ", ncv=%" PetscInt_FMT ", mpd=%" PetscInt_FMT "\n",nev,ncv,mpd);

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

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

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

    112:   EPSGetST(eps,&st);
    113:   STGetKSP(st,&ksp);
    114:   KSPSetTolerances(ksp,1e-8,1e-35,PETSC_DEFAULT,PETSC_DEFAULT);
    115:   STView(st,NULL);
    116:   EPSGetDS(eps,&ds);
    117:   DSView(ds,NULL);

    119:   EPSSetFromOptions(eps);
    120:   EPSSolve(eps);
    121:   EPSGetConvergedReason(eps,&reason);
    122:   EPSGetIterationNumber(eps,&its);
    123:   PetscPrintf(PETSC_COMM_WORLD," Finished - converged reason = %d, its=%" PetscInt_FMT "\n",(int)reason,its);

    125:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
    126:                     Display solution and clean up
    127:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
    128:   EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);
    129:   EPSDestroy(&eps);
    130:   MatDestroy(&A);
    131:   SlepcFinalize();
    132:   return 0;
    133: }

    135: /*TEST

    137:    test:
    138:       suffix: 1
    139:       args: -eps_ncv 14
    140:       filter: sed -e "s/00001/00000/" | sed -e "s/4.99999/5.00000/" | sed -e "s/5.99999/6.00000/"

    142: TEST*/