Date: 2022-03-31T15:29:12+00:00

Actual source code: test3.c
slepc-3.17.0 2022-03-31
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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[] = "Tests multiple calls to EPSSolve with different matrix.\n\n";

     13: #include <slepceps.h>

     15: int main(int argc,char **argv)
     16: {
     17:   Mat            A1,A2;       /* problem matrices */
     18:   EPS            eps;         /* eigenproblem solver context */
     19:   PetscReal      tol=PETSC_SMALL,v;
     20:   Vec            d;
     21:   PetscInt       n=30,i,Istart,Iend;
     22:   PetscRandom    myrand;

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

     26:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
     27:   PetscPrintf(PETSC_COMM_WORLD,"\nTridiagonal with random diagonal, n=%" PetscInt_FMT "\n\n",n);

     29:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     30:            Create matrix tridiag([-1 0 -1])
     31:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     32:   MatCreate(PETSC_COMM_WORLD,&A1);
     33:   MatSetSizes(A1,PETSC_DECIDE,PETSC_DECIDE,n,n);
     34:   MatSetFromOptions(A1);
     35:   MatSetUp(A1);

     37:   MatGetOwnershipRange(A1,&Istart,&Iend);
     38:   for (i=Istart;i<Iend;i++) {
     39:     if (i>0) MatSetValue(A1,i,i-1,-1.0,INSERT_VALUES);
     40:     if (i<n-1) MatSetValue(A1,i,i+1,-1.0,INSERT_VALUES);
     41:   }
     42:   MatAssemblyBegin(A1,MAT_FINAL_ASSEMBLY);
     43:   MatAssemblyEnd(A1,MAT_FINAL_ASSEMBLY);

     45:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     46:        Create two matrices by filling the diagonal with rand values
     47:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     48:   MatDuplicate(A1,MAT_COPY_VALUES,&A2);
     49:   MatCreateVecs(A1,NULL,&d);
     50:   PetscRandomCreate(PETSC_COMM_WORLD,&myrand);
     51:   PetscRandomSetFromOptions(myrand);
     52:   PetscRandomSetInterval(myrand,0.0,1.0);
     53:   for (i=Istart;i<Iend;i++) {
     54:     PetscRandomGetValueReal(myrand,&v);
     55:     VecSetValue(d,i,v,INSERT_VALUES);
     56:   }
     57:   VecAssemblyBegin(d);
     58:   VecAssemblyEnd(d);
     59:   MatDiagonalSet(A1,d,INSERT_VALUES);
     60:   for (i=Istart;i<Iend;i++) {
     61:     PetscRandomGetValueReal(myrand,&v);
     62:     VecSetValue(d,i,v,INSERT_VALUES);
     63:   }
     64:   VecAssemblyBegin(d);
     65:   VecAssemblyEnd(d);
     66:   MatDiagonalSet(A2,d,INSERT_VALUES);
     67:   VecDestroy(&d);
     68:   PetscRandomDestroy(&myrand);

     70:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     71:                         Create the eigensolver
     72:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     73:   EPSCreate(PETSC_COMM_WORLD,&eps);
     74:   EPSSetProblemType(eps,EPS_HEP);
     75:   EPSSetTolerances(eps,tol,PETSC_DEFAULT);
     76:   EPSSetOperators(eps,A1,NULL);
     77:   EPSSetFromOptions(eps);

     79:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     80:                         Solve first eigenproblem
     81:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     82:   EPSSolve(eps);
     83:   PetscPrintf(PETSC_COMM_WORLD," - - - First matrix - - -\n");
     84:   EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);

     86:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
     87:                         Solve second eigenproblem
     88:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
     89:   EPSSetOperators(eps,A2,NULL);
     90:   EPSSolve(eps);
     91:   PetscPrintf(PETSC_COMM_WORLD," - - - Second matrix - - -\n");
     92:   EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);

     94:   EPSDestroy(&eps);
     95:   MatDestroy(&A1);
     96:   MatDestroy(&A2);
     97:   SlepcFinalize();
     98:   return 0;
     99: }

    101: /*TEST

    103:    testset:
    104:       args: -eps_nev 4
    105:       requires: !single
    106:       output_file: output/test3_1.out
    107:       test:
    108:          suffix: 1
    109:          args: -eps_type {{krylovschur subspace arnoldi lapack}}
    110:       test:
    111:          suffix: 1_lanczos
    112:          args: -eps_type lanczos -eps_lanczos_reorthog local
    113:       test:
    114:          suffix: 1_power
    115:          args: -eps_type power -eps_max_it 20000
    116:       test:
    117:          suffix: 1_jd
    118:          args: -eps_type jd -eps_jd_initial_size 7
    119:       test:
    120:          suffix: 1_gd
    121:          args: -eps_type gd -eps_gd_initial_size 7
    122:       test:
    123:          suffix: 1_gd2
    124:          args: -eps_type gd -eps_gd_double_expansion
    125:       test:
    126:          suffix: 1_arpack
    127:          args: -eps_type arpack
    128:          requires: arpack
    129:       test:
    130:          suffix: 1_primme
    131:          args: -eps_type primme -eps_conv_abs -eps_primme_blocksize 4
    132:          requires: primme
    133:       test:
    134:          suffix: 1_trlan
    135:          args: -eps_type trlan
    136:          requires: trlan
    137:       test:
    138:          suffix: 1_scalapack
    139:          args: -eps_type scalapack
    140:          requires: scalapack
    141:       test:
    142:          suffix: 1_elpa
    143:          args: -eps_type elpa
    144:          requires: elpa
    145:       test:
    146:          suffix: 1_elemental
    147:          args: -eps_type elemental
    148:          requires: elemental

    150:    testset:
    151:       args: -eps_nev 4 -eps_smallest_real -eps_max_it 500
    152:       output_file: output/test3_2.out
    153:       test:
    154:          suffix: 2_rqcg
    155:          args: -eps_type rqcg -eps_rqcg_reset 5 -eps_ncv 32
    156:       test:
    157:          suffix: 2_lobpcg
    158:          args: -eps_type lobpcg -eps_lobpcg_blocksize 5 -st_pc_type none
    159:       test:
    160:          suffix: 2_lanczos
    161:          args: -eps_type lanczos -eps_lanczos_reorthog local
    162:          requires: !single
    163:       test:
    164:          suffix: 2_lanczos_delayed
    165:          args: -eps_type lanczos -eps_lanczos_reorthog delayed -eps_tol 1e-8
    166:          requires: !single
    167:       test:
    168:          suffix: 2_trlan
    169:          args: -eps_type trlan
    170:          requires: trlan
    171:       test:
    172:          suffix: 2_blopex
    173:          args: -eps_type blopex -eps_conv_abs -st_shift -2
    174:          requires: blopex

    176: TEST*/