Actual source code: test5.c

slepc-3.11.2 2019-07-30
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  1: /*
  2:    - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  3:    SLEPc - Scalable Library for Eigenvalue Problem Computations
  4:    Copyright (c) 2002-2019, 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;

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

 30:   /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 31:      Create non-symmetric matrix
 32:      - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

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

 39:   MatGetOwnershipRange(A,&Istart,&Iend);
 40:   for (II=Istart;II<Iend;II++) {
 41:     i = II/n; j = II-i*n;
 42:     d = 0.0;
 43:     if (i>0) { MatSetValue(A,II,II-n,1.0,INSERT_VALUES); d=d+1.0; }
 44:     if (i<n-1) { MatSetValue(A,II,II+n,-1.0,INSERT_VALUES); d=d+1.0; }
 45:     if (j>0) { MatSetValue(A,II,II-1,1.0,INSERT_VALUES); d=d+1.0; }
 46:     if (j<n-1) { MatSetValue(A,II,II+1,-1.0,INSERT_VALUES); d=d+1.0; }
 47:     MatSetValue(A,II,II,d,INSERT_VALUES);
 48:   }

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

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

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

 80:   STSetFromOptions(st);

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

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

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

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

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

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

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

113:   STDestroy(&st);
114:   MatDestroy(&A);
115:   VecDestroy(&v);
116:   VecDestroy(&w);
117:   SlepcFinalize();
118:   return ierr;
119: }

121: /*TEST

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

131: TEST*/