Actual source code: test28.c

slepc-3.18.3 2023-03-24
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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 of different size.\n\n"
 12:   "The command line options are:\n"
 13:   "  -n <n>, where <n> = number of grid subdivisions in x dimension.\n"
 14:   "  -m <m>, where <m> = number of grid subdivisions in y dimension.\n\n";

 16: #include <slepceps.h>

 18: int main(int argc,char **argv)
 19: {
 20:   Mat            A,B;
 21:   EPS            eps;
 22:   PetscInt       N,n=10,m=11,Istart,Iend,II,nev=3,i,j;
 23:   PetscBool      flag,terse;

 26:   SlepcInitialize(&argc,&argv,(char*)0,help);
 27:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 28:   PetscOptionsGetInt(NULL,NULL,"-m",&m,&flag);
 29:   N = n*m;
 30:   PetscPrintf(PETSC_COMM_WORLD,"\n2-D Laplacian Eigenproblem, N=%" PetscInt_FMT " (%" PetscInt_FMT "x%" PetscInt_FMT " grid)\n\n",N,n,m);

 32:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 33:                 Create the 2-D Laplacian with coarse mesh
 34:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

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

 52:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 53:         Create the eigensolver, set options and solve the eigensystem
 54:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 56:   EPSCreate(PETSC_COMM_WORLD,&eps);
 57:   EPSSetOperators(eps,A,NULL);
 58:   EPSSetProblemType(eps,EPS_HEP);
 59:   EPSSetWhichEigenpairs(eps,EPS_SMALLEST_REAL);
 60:   EPSSetDimensions(eps,nev,PETSC_DEFAULT,PETSC_DEFAULT);
 61:   EPSSetFromOptions(eps);

 63:   EPSSolve(eps);

 65:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 66:                     Display solution of first solve
 67:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 69:   PetscOptionsHasName(NULL,NULL,"-terse",&terse);
 70:   if (terse) EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);
 71:   else {
 72:     PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL);
 73:     EPSConvergedReasonView(eps,PETSC_VIEWER_STDOUT_WORLD);
 74:     EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD);
 75:     PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);
 76:   }

 78:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 79:                Create the 2-D Laplacian with finer mesh
 80:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 82:   n *= 2;
 83:   m *= 2;
 84:   N = n*m;
 85:   PetscPrintf(PETSC_COMM_WORLD,"\n2-D Laplacian Eigenproblem, N=%" PetscInt_FMT " (%" PetscInt_FMT "x%" PetscInt_FMT " grid)\n\n",N,n,m);

 87:   MatCreate(PETSC_COMM_WORLD,&B);
 88:   MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,N,N);
 89:   MatSetFromOptions(B);
 90:   MatSetUp(B);
 91:   MatGetOwnershipRange(B,&Istart,&Iend);
 92:   for (II=Istart;II<Iend;II++) {
 93:     i = II/n; j = II-i*n;
 94:     if (i>0) MatSetValue(B,II,II-n,-1.0,INSERT_VALUES);
 95:     if (i<m-1) MatSetValue(B,II,II+n,-1.0,INSERT_VALUES);
 96:     if (j>0) MatSetValue(B,II,II-1,-1.0,INSERT_VALUES);
 97:     if (j<n-1) MatSetValue(B,II,II+1,-1.0,INSERT_VALUES);
 98:     MatSetValue(B,II,II,4.0,INSERT_VALUES);
 99:   }
100:   MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);
101:   MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);

103:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
104:        Solve again, calling EPSReset() since matrix size has changed
105:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

107:   /* EPSReset(eps); */  /* not required, will be called in EPSSetOperators() */
108:   EPSSetOperators(eps,B,NULL);
109:   EPSSolve(eps);

111:   if (terse) EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);
112:   else {
113:     PetscViewerPushFormat(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_ASCII_INFO_DETAIL);
114:     EPSConvergedReasonView(eps,PETSC_VIEWER_STDOUT_WORLD);
115:     EPSErrorView(eps,EPS_ERROR_RELATIVE,PETSC_VIEWER_STDOUT_WORLD);
116:     PetscViewerPopFormat(PETSC_VIEWER_STDOUT_WORLD);
117:   }

119:   EPSDestroy(&eps);
120:   MatDestroy(&A);
121:   MatDestroy(&B);
122:   SlepcFinalize();
123:   return 0;
124: }

126: /*TEST

128:    testset:
129:       requires: !single
130:       output_file: output/test28_1.out
131:       test:
132:          suffix: 1
133:          args: -eps_type {{krylovschur arnoldi gd jd rqcg lobpcg lapack}} -terse
134:       test:
135:          suffix: 1_lanczos
136:          args: -eps_type lanczos -eps_lanczos_reorthog local -terse

138:    test:
139:       suffix: 2
140:       args: -eps_type {{power subspace}} -eps_target 8 -st_type sinvert -terse

142:    testset:
143:       args: -eps_interval 0.5,0.67 -terse
144:       output_file: output/test28_3.out
145:       test:
146:          suffix: 3
147:          args: -st_type sinvert -st_pc_type cholesky
148:          requires: !single
149:       test:
150:          suffix: 3_evsl
151:          nsize: {{1 2}}
152:          args: -eps_type evsl -eps_evsl_dos_method lanczos
153:          requires: evsl

155: TEST*/