Actual source code: test3.c
slepc-3.21.1 2024-04-26
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 PEP interface functions.\n\n";
13: #include <slepcpep.h>
15: int main(int argc,char **argv)
16: {
17: Mat A[3],B; /* problem matrices */
18: PEP pep; /* eigenproblem solver context */
19: ST st;
20: KSP ksp;
21: Vec Dl,Dr;
22: DS ds;
23: PetscReal tol,alpha;
24: PetscScalar target;
25: PetscInt n=20,i,its,nev,ncv,mpd,Istart,Iend,nmat;
26: PEPWhich which;
27: PEPConvergedReason reason;
28: PEPType type;
29: PEPExtract extr;
30: PEPBasis basis;
31: PEPScale scale;
32: PEPRefine refine;
33: PEPRefineScheme rscheme;
34: PEPConv conv;
35: PEPStop stop;
36: PEPProblemType ptype;
37: PetscViewerAndFormat *vf;
39: PetscFunctionBeginUser;
40: PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
41: PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nDiagonal Quadratic Eigenproblem, n=%" PetscInt_FMT "\n\n",n));
43: PetscCall(MatCreate(PETSC_COMM_WORLD,&A[0]));
44: PetscCall(MatSetSizes(A[0],PETSC_DECIDE,PETSC_DECIDE,n,n));
45: PetscCall(MatSetFromOptions(A[0]));
46: PetscCall(MatGetOwnershipRange(A[0],&Istart,&Iend));
47: for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A[0],i,i,i+1,INSERT_VALUES));
48: PetscCall(MatAssemblyBegin(A[0],MAT_FINAL_ASSEMBLY));
49: PetscCall(MatAssemblyEnd(A[0],MAT_FINAL_ASSEMBLY));
51: PetscCall(MatCreate(PETSC_COMM_WORLD,&A[1]));
52: PetscCall(MatSetSizes(A[1],PETSC_DECIDE,PETSC_DECIDE,n,n));
53: PetscCall(MatSetFromOptions(A[1]));
54: PetscCall(MatGetOwnershipRange(A[1],&Istart,&Iend));
55: for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A[1],i,i,1.0,INSERT_VALUES));
56: PetscCall(MatAssemblyBegin(A[1],MAT_FINAL_ASSEMBLY));
57: PetscCall(MatAssemblyEnd(A[1],MAT_FINAL_ASSEMBLY));
59: PetscCall(MatCreate(PETSC_COMM_WORLD,&A[2]));
60: PetscCall(MatSetSizes(A[2],PETSC_DECIDE,PETSC_DECIDE,n,n));
61: PetscCall(MatSetFromOptions(A[2]));
62: PetscCall(MatGetOwnershipRange(A[1],&Istart,&Iend));
63: for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A[2],i,i,n/(PetscReal)(i+1),INSERT_VALUES));
64: PetscCall(MatAssemblyBegin(A[2],MAT_FINAL_ASSEMBLY));
65: PetscCall(MatAssemblyEnd(A[2],MAT_FINAL_ASSEMBLY));
67: PetscCall(MatCreateVecs(A[0],&Dr,&Dl));
68: PetscCall(VecSet(Dl,1.0));
69: PetscCall(VecSet(Dr,0.95));
71: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
72: Create eigensolver and test interface functions
73: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
74: PetscCall(PEPCreate(PETSC_COMM_WORLD,&pep));
75: PetscCall(PEPSetOperators(pep,3,A));
76: PetscCall(PEPGetNumMatrices(pep,&nmat));
77: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Polynomial of degree %" PetscInt_FMT "\n",nmat-1));
78: PetscCall(PEPGetOperators(pep,0,&B));
79: PetscCall(MatView(B,NULL));
81: PetscCall(PEPSetType(pep,PEPTOAR));
82: PetscCall(PEPGetType(pep,&type));
83: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Type set to %s\n",type));
85: PetscCall(PEPGetProblemType(pep,&ptype));
86: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Problem type before changing = %d",(int)ptype));
87: PetscCall(PEPSetProblemType(pep,PEP_HERMITIAN));
88: PetscCall(PEPGetProblemType(pep,&ptype));
89: PetscCall(PetscPrintf(PETSC_COMM_WORLD," ... changed to %d.\n",(int)ptype));
91: PetscCall(PEPGetExtract(pep,&extr));
92: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Extraction before changing = %d",(int)extr));
93: PetscCall(PEPSetExtract(pep,PEP_EXTRACT_STRUCTURED));
94: PetscCall(PEPGetExtract(pep,&extr));
95: PetscCall(PetscPrintf(PETSC_COMM_WORLD," ... changed to %d\n",(int)extr));
97: PetscCall(PEPSetScale(pep,PEP_SCALE_BOTH,.1,Dl,Dr,5,1.0));
98: PetscCall(PEPGetScale(pep,&scale,&alpha,NULL,NULL,&its,NULL));
99: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Scaling: %s, alpha=%g, its=%" PetscInt_FMT "\n",PEPScaleTypes[scale],(double)alpha,its));
101: PetscCall(PEPSetBasis(pep,PEP_BASIS_CHEBYSHEV1));
102: PetscCall(PEPGetBasis(pep,&basis));
103: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Polynomial basis: %s\n",PEPBasisTypes[basis]));
105: PetscCall(PEPSetRefine(pep,PEP_REFINE_SIMPLE,1,1e-9,2,PEP_REFINE_SCHEME_SCHUR));
106: PetscCall(PEPGetRefine(pep,&refine,NULL,&tol,&its,&rscheme));
107: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Refinement: %s, tol=%g, its=%" PetscInt_FMT ", scheme=%s\n",PEPRefineTypes[refine],(double)tol,its,PEPRefineSchemes[rscheme]));
109: PetscCall(PEPSetTarget(pep,4.8));
110: PetscCall(PEPGetTarget(pep,&target));
111: PetscCall(PEPSetWhichEigenpairs(pep,PEP_TARGET_MAGNITUDE));
112: PetscCall(PEPGetWhichEigenpairs(pep,&which));
113: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Which = %d, target = %g\n",(int)which,(double)PetscRealPart(target)));
115: PetscCall(PEPSetDimensions(pep,4,PETSC_DEFAULT,PETSC_DEFAULT));
116: PetscCall(PEPGetDimensions(pep,&nev,&ncv,&mpd));
117: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Dimensions: nev=%" PetscInt_FMT ", ncv=%" PetscInt_FMT ", mpd=%" PetscInt_FMT "\n",nev,ncv,mpd));
119: PetscCall(PEPSetTolerances(pep,2.2e-4,200));
120: PetscCall(PEPGetTolerances(pep,&tol,&its));
121: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Tolerance = %.5f, max_its = %" PetscInt_FMT "\n",(double)tol,its));
123: PetscCall(PEPSetConvergenceTest(pep,PEP_CONV_ABS));
124: PetscCall(PEPGetConvergenceTest(pep,&conv));
125: PetscCall(PEPSetStoppingTest(pep,PEP_STOP_BASIC));
126: PetscCall(PEPGetStoppingTest(pep,&stop));
127: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Convergence test = %d, stopping test = %d\n",(int)conv,(int)stop));
129: PetscCall(PetscViewerAndFormatCreate(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_DEFAULT,&vf));
130: PetscCall(PEPMonitorSet(pep,(PetscErrorCode (*)(PEP,PetscInt,PetscInt,PetscScalar*,PetscScalar*,PetscReal*,PetscInt,void*))PEPMonitorFirst,vf,(PetscErrorCode (*)(void**))PetscViewerAndFormatDestroy));
131: PetscCall(PEPMonitorCancel(pep));
133: PetscCall(PEPGetST(pep,&st));
134: PetscCall(STGetKSP(st,&ksp));
135: PetscCall(KSPSetTolerances(ksp,1e-8,1e-35,PETSC_DEFAULT,PETSC_DEFAULT));
136: PetscCall(STView(st,NULL));
137: PetscCall(PEPGetDS(pep,&ds));
138: PetscCall(DSView(ds,NULL));
140: PetscCall(PEPSetFromOptions(pep));
141: PetscCall(PEPSolve(pep));
142: PetscCall(PEPGetConvergedReason(pep,&reason));
143: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Finished - converged reason = %d\n",(int)reason));
145: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
146: Display solution and clean up
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148: PetscCall(PEPErrorView(pep,PEP_ERROR_RELATIVE,NULL));
149: PetscCall(PEPDestroy(&pep));
150: PetscCall(MatDestroy(&A[0]));
151: PetscCall(MatDestroy(&A[1]));
152: PetscCall(MatDestroy(&A[2]));
153: PetscCall(VecDestroy(&Dl));
154: PetscCall(VecDestroy(&Dr));
155: PetscCall(SlepcFinalize());
156: return 0;
157: }
159: /*TEST
161: test:
162: suffix: 1
163: args: -pep_tol 1e-6 -pep_ncv 22
164: filter: sed -e "s/[+-]0\.0*i//g"
166: TEST*/