Actual source code: test5.c
slepc-3.20.2 2024-03-15
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: PetscFunctionBeginUser;
26: PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
27: PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
28: N = n*n;
30: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
31: Create non-symmetric matrix
32: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
34: PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
35: PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N));
36: PetscCall(MatSetFromOptions(A));
37: PetscCall(MatSetUp(A));
39: PetscCall(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) { PetscCall(MatSetValue(A,II,II-n,1.0,INSERT_VALUES)); d=d+1.0; }
44: if (i<n-1) { PetscCall(MatSetValue(A,II,II+n,-1.0,INSERT_VALUES)); d=d+1.0; }
45: if (j>0) { PetscCall(MatSetValue(A,II,II-1,1.0,INSERT_VALUES)); d=d+1.0; }
46: if (j<n-1) { PetscCall(MatSetValue(A,II,II+1,-1.0,INSERT_VALUES)); d=d+1.0; }
47: PetscCall(MatSetValue(A,II,II,d,INSERT_VALUES));
48: }
50: PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
51: PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));
52: PetscCall(MatCreateVecs(A,&v,&w));
53: PetscCall(VecSetValue(v,0,-.5,INSERT_VALUES));
54: PetscCall(VecSetValue(v,1,1.5,INSERT_VALUES));
55: PetscCall(VecSetValue(v,2,2,INSERT_VALUES));
56: PetscCall(VecAssemblyBegin(v));
57: PetscCall(VecAssemblyEnd(v));
58: PetscCall(VecView(v,NULL));
60: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
61: Create the spectral transformation object
62: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
63: PetscCall(STCreate(PETSC_COMM_WORLD,&st));
64: mat[0] = A;
65: PetscCall(STSetMatrices(st,1,mat));
66: PetscCall(STSetType(st,STCAYLEY));
67: PetscCall(STSetShift(st,2.0));
68: PetscCall(STCayleySetAntishift(st,1.0));
69: PetscCall(STSetTransform(st,PETSC_TRUE));
71: PetscCall(KSPCreate(PETSC_COMM_WORLD,&ksp));
72: PetscCall(KSPSetType(ksp,KSPPREONLY));
73: PetscCall(KSPGetPC(ksp,&pc));
74: PetscCall(PCSetType(pc,PCLU));
75: PetscCall(KSPSetTolerances(ksp,100*PETSC_MACHINE_EPSILON,PETSC_DEFAULT,PETSC_DEFAULT,PETSC_DEFAULT));
76: PetscCall(KSPSetFromOptions(ksp));
77: PetscCall(STSetKSP(st,ksp));
78: PetscCall(KSPDestroy(&ksp));
80: PetscCall(STSetFromOptions(st));
82: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
83: Apply the operator
84: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
85: PetscCall(STApply(st,v,w));
86: PetscCall(VecView(w,NULL));
88: PetscCall(STApplyTranspose(st,v,w));
89: PetscCall(VecView(w,NULL));
91: PetscCall(STMatMult(st,1,v,w));
92: PetscCall(VecView(w,NULL));
94: PetscCall(STMatMultTranspose(st,1,v,w));
95: PetscCall(VecView(w,NULL));
97: PetscCall(STMatSolve(st,v,w));
98: PetscCall(VecView(w,NULL));
100: PetscCall(STMatSolveTranspose(st,v,w));
101: PetscCall(VecView(w,NULL));
103: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
104: Get the operator matrix
105: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
106: PetscCall(STGetOperator(st,&Op));
107: PetscCall(MatMult(Op,v,w));
108: PetscCall(VecView(w,NULL));
109: PetscCall(MatMultTranspose(Op,v,w));
110: PetscCall(VecView(w,NULL));
111: PetscCall(STRestoreOperator(st,&Op));
113: PetscCall(STDestroy(&st));
114: PetscCall(MatDestroy(&A));
115: PetscCall(VecDestroy(&v));
116: PetscCall(VecDestroy(&w));
117: PetscCall(SlepcFinalize());
118: return 0;
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*/