Actual source code: test3.c

slepc-3.16.0 2021-09-30
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  1: /*
  2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  4:    Copyright (c) 2002-2021, 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;

 25:   SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;

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

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

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

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

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

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

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

 95:   EPSDestroy(&eps);
 96:   MatDestroy(&A1);
 97:   MatDestroy(&A2);
 98:   SlepcFinalize();
 99:   return ierr;
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*/