Actual source code: test3.c

slepc-3.19.0 2023-03-31
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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:   PetscFunctionBeginUser;
 25:   PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));

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

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

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

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

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

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

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

 95:   PetscCall(EPSDestroy(&eps));
 96:   PetscCall(MatDestroy(&A1));
 97:   PetscCall(MatDestroy(&A2));
 98:   PetscCall(SlepcFinalize());
 99:   return 0;
100: }

102: /*TEST

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

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

177: TEST*/