Actual source code: test31.c

      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 STFILTER interface functions.\n\n"
     12:   "Based on ex2.\n"
     13:   "The command line options are:\n"
     14:   "  -n <n>, where <n> = number of grid subdivisions in x dimension.\n"
     15:   "  -m <m>, where <m> = number of grid subdivisions in y dimension.\n\n";

     17: #include <slepceps.h>

     19: int main(int argc,char **argv)
     20: {
     21:   Mat            A;
     22:   EPS            eps;
     23:   ST             st;
     24:   PetscInt       N,n=10,m,Istart,Iend,II,i,j,degree;
     25:   PetscBool      flag,modify=PETSC_FALSE,terse;
     26:   PetscReal      inta,intb,rleft,rright;

     28:   PetscFunctionBeginUser;
     29:   PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
     30:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
     31:   PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,&flag));
     32:   if (!flag) m=n;
     33:   N = n*m;
     34:   PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\n2-D Laplacian Eigenproblem, N=%" PetscInt_FMT " (%" PetscInt_FMT "x%" PetscInt_FMT " grid)\n\n",N,n,m));
     35:   PetscCall(PetscOptionsGetBool(NULL,NULL,"-modify",&modify,&flag));

     37:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     38:                     Create the 2-D Laplacian
     39:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

     41:   PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
     42:   PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N));
     43:   PetscCall(MatSetFromOptions(A));
     44:   PetscCall(MatGetOwnershipRange(A,&Istart,&Iend));
     45:   for (II=Istart;II<Iend;II++) {
     46:     i = II/n; j = II-i*n;
     47:     if (i>0) PetscCall(MatSetValue(A,II,II-n,-1.0,INSERT_VALUES));
     48:     if (i<m-1) PetscCall(MatSetValue(A,II,II+n,-1.0,INSERT_VALUES));
     49:     if (j>0) PetscCall(MatSetValue(A,II,II-1,-1.0,INSERT_VALUES));
     50:     if (j<n-1) PetscCall(MatSetValue(A,II,II+1,-1.0,INSERT_VALUES));
     51:     PetscCall(MatSetValue(A,II,II,4.0,INSERT_VALUES));
     52:   }
     53:   PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
     54:   PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));

     56:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     57:                 Create the eigensolver and set various options
     58:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

     60:   PetscCall(EPSCreate(PETSC_COMM_WORLD,&eps));
     61:   PetscCall(EPSSetOperators(eps,A,NULL));
     62:   PetscCall(EPSSetProblemType(eps,EPS_HEP));
     63:   PetscCall(EPSSetType(eps,EPSKRYLOVSCHUR));
     64:   PetscCall(EPSSetWhichEigenpairs(eps,EPS_ALL));
     65:   PetscCall(EPSSetInterval(eps,0.5,1.3));
     66:   PetscCall(EPSGetST(eps,&st));
     67:   PetscCall(STSetType(st,STFILTER));
     68:   PetscCall(EPSSetFromOptions(eps));

     70:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     71:                 Solve the problem and display the solution
     72:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

     74:   PetscCall(EPSSolve(eps));

     76:   /* print filter information */
     77:   PetscCall(PetscObjectTypeCompare((PetscObject)st,STFILTER,&flag));
     78:   if (flag) {
     79:     PetscCall(STFilterGetDegree(st,&degree));
     80:     PetscCall(PetscPrintf(PETSC_COMM_WORLD," Filter degree: %" PetscInt_FMT "\n",degree));
     81:     PetscCall(STFilterGetInterval(st,&inta,&intb));
     82:     PetscCall(STFilterGetRange(st,&rleft,&rright));
     83:     PetscCall(PetscPrintf(PETSC_COMM_WORLD," Requested interval: [%g,%g],  range: [%g,%g]\n\n",(double)inta,(double)intb,(double)rleft,(double)rright));
     84:   }

     86:   PetscCall(PetscOptionsHasName(NULL,NULL,"-terse",&terse));
     87:   if (terse) PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
     88:   else {
     89:     PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL));
     90:     PetscCall(EPSConvergedReasonView(eps,PETSC_VIEWER_STDOUT_WORLD));
     91:     PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD));
     92:     PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
     93:   }

     95:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     96:               Solve the problem again after changing the matrix
     97:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     98:   if (modify) {
     99:     PetscCall(MatSetValue(A,0,0,0.3,INSERT_VALUES));
    100:     PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
    101:     PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));
    102:     PetscCall(EPSSetOperators(eps,A,NULL));
    103:     PetscCall(EPSSolve(eps));
    104:     PetscCall(PetscOptionsHasName(NULL,NULL,"-terse",&terse));
    105:     if (terse) PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
    106:     else {
    107:       PetscCall(PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL));
    108:       PetscCall(EPSConvergedReasonView(eps,PETSC_VIEWER_STDOUT_WORLD));
    109:       PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD));
    110:       PetscCall(PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD));
    111:     }
    112:   }

    114:   PetscCall(EPSDestroy(&eps));
    115:   PetscCall(MatDestroy(&A));
    116:   PetscCall(SlepcFinalize());
    117:   return 0;
    118: }

    120: /*TEST

    122:    test:
    123:       suffix: 1
    124:       args: -terse
    125:       filter: sed -e "s/0.161982,7.83797/0.162007,7.83897/"
    126:       requires: !single

    128:    test:
    129:       suffix: 2
    130:       args: -modify -st_filter_range -0.5,8 -terse
    131:       requires: !single

    133:    test:
    134:       suffix: 3
    135:       args: -modify -terse
    136:       filter: sed -e "s/0.161982,7.83797/0.162007,7.83897/"
    137:       requires: !single

    139:    test:
    140:       suffix: 4
    141:       args: -terse -st_filter_type chebyshev -st_filter_damping {{none jackson}}
    142:       filter: sed -e "s/0.161982,7.83797/0.162007,7.83897/"
    143:       output_file: output/test31_1.out
    144:       requires: !single

    146:    test:
    147:       suffix: 5
    148:       args: -modify -terse -st_filter_range -0.5,8 -st_filter_type chebyshev -st_filter_damping {{lanczos fejer}}
    149:       output_file: output/test31_2.out
    150:       requires: !single

    152: TEST*/