Actual source code: test5.c

slepc-3.17.2 2022-08-09
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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[] = "Test various ST interface functions.\n\n";

 13: #include <slepceps.h>

 15: int main (int argc,char **argv)
 16: {
 17:   ST             st;
 18:   KSP            ksp;
 19:   PC             pc;
 20:   Mat            A,mat[1],Op;
 21:   Vec            v,w;
 22:   PetscInt       N,n=4,i,j,II,Istart,Iend;
 23:   PetscScalar    d;

 25:   SlepcInitialize(&argc,&argv,(char*)0,help);
 26:   PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
 27:   N = n*n;

 29:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 30:      Create non-symmetric matrix
 31:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

 33:   MatCreate(PETSC_COMM_WORLD,&A);
 34:   MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N);
 35:   MatSetFromOptions(A);
 36:   MatSetUp(A);

 38:   MatGetOwnershipRange(A,&Istart,&Iend);
 39:   for (II=Istart;II<Iend;II++) {
 40:     i = II/n; j = II-i*n;
 41:     d = 0.0;
 42:     if (i>0) { MatSetValue(A,II,II-n,1.0,INSERT_VALUES); d=d+1.0; }
 43:     if (i<n-1) { MatSetValue(A,II,II+n,-1.0,INSERT_VALUES); d=d+1.0; }
 44:     if (j>0) { MatSetValue(A,II,II-1,1.0,INSERT_VALUES); d=d+1.0; }
 45:     if (j<n-1) { MatSetValue(A,II,II+1,-1.0,INSERT_VALUES); d=d+1.0; }
 46:     MatSetValue(A,II,II,d,INSERT_VALUES);
 47:   }

 49:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
 50:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
 51:   MatCreateVecs(A,&v,&w);
 52:   VecSetValue(v,0,-.5,INSERT_VALUES);
 53:   VecSetValue(v,1,1.5,INSERT_VALUES);
 54:   VecSetValue(v,2,2,INSERT_VALUES);
 55:   VecAssemblyBegin(v);
 56:   VecAssemblyEnd(v);
 57:   VecView(v,NULL);

 59:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 60:      Create the spectral transformation object
 61:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 62:   STCreate(PETSC_COMM_WORLD,&st);
 63:   mat[0] = A;
 64:   STSetMatrices(st,1,mat);
 65:   STSetType(st,STCAYLEY);
 66:   STSetShift(st,2.0);
 67:   STCayleySetAntishift(st,1.0);
 68:   STSetTransform(st,PETSC_TRUE);

 70:   KSPCreate(PETSC_COMM_WORLD,&ksp);
 71:   KSPSetType(ksp,KSPPREONLY);
 72:   KSPGetPC(ksp,&pc);
 73:   PCSetType(pc,PCLU);
 74:   KSPSetTolerances(ksp,100*PETSC_MACHINE_EPSILON,PETSC_DEFAULT,PETSC_DEFAULT,PETSC_DEFAULT);
 75:   KSPSetFromOptions(ksp);
 76:   STSetKSP(st,ksp);
 77:   KSPDestroy(&ksp);

 79:   STSetFromOptions(st);

 81:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 82:      Apply the operator
 83:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
 84:   STApply(st,v,w);
 85:   VecView(w,NULL);

 87:   STApplyTranspose(st,v,w);
 88:   VecView(w,NULL);

 90:   STMatMult(st,1,v,w);
 91:   VecView(w,NULL);

 93:   STMatMultTranspose(st,1,v,w);
 94:   VecView(w,NULL);

 96:   STMatSolve(st,v,w);
 97:   VecView(w,NULL);

 99:   STMatSolveTranspose(st,v,w);
100:   VecView(w,NULL);

102:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
103:      Get the operator matrix
104:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
105:   STGetOperator(st,&Op);
106:   MatMult(Op,v,w);
107:   VecView(w,NULL);
108:   MatMultTranspose(Op,v,w);
109:   VecView(w,NULL);
110:   STRestoreOperator(st,&Op);

112:   STDestroy(&st);
113:   MatDestroy(&A);
114:   VecDestroy(&v);
115:   VecDestroy(&w);
116:   SlepcFinalize();
117:   return 0;
118: }

120: /*TEST

122:    testset:
123:       output_file: output/test5_1.out
124:       requires: !single
125:       test:
126:          args: -st_matmode {{copy inplace}}
127:       test:
128:          args: -st_matmode shell -ksp_type bcgs -pc_type jacobi

130: TEST*/