Actual source code: test3.c

slepc-3.17.1 2022-04-11
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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*/