Actual source code: test2.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 NEP interface functions.\n\n";
13: #include <slepcnep.h>
15: int main(int argc,char **argv)
16: {
17: Mat A[3],B; /* problem matrices */
18: FN f[3],g; /* problem functions */
19: NEP nep; /* eigenproblem solver context */
20: DS ds;
21: RG rg;
22: PetscReal tol;
23: PetscScalar coeffs[2],target;
24: PetscInt n=20,i,its,nev,ncv,mpd,Istart,Iend,nterm;
25: PetscBool twoside;
26: NEPWhich which;
27: NEPConvergedReason reason;
28: NEPType type;
29: NEPRefine refine;
30: NEPRefineScheme rscheme;
31: NEPConv conv;
32: NEPStop stop;
33: NEPProblemType ptype;
34: MatStructure mstr;
35: PetscViewerAndFormat *vf;
37: PetscFunctionBeginUser;
38: PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
39: PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nDiagonal Nonlinear Eigenproblem, n=%" PetscInt_FMT "\n\n",n));
41: /*
42: Matrices
43: */
44: PetscCall(MatCreate(PETSC_COMM_WORLD,&A[0]));
45: PetscCall(MatSetSizes(A[0],PETSC_DECIDE,PETSC_DECIDE,n,n));
46: PetscCall(MatSetFromOptions(A[0]));
47: PetscCall(MatGetOwnershipRange(A[0],&Istart,&Iend));
48: for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A[0],i,i,i+1,INSERT_VALUES));
49: PetscCall(MatAssemblyBegin(A[0],MAT_FINAL_ASSEMBLY));
50: PetscCall(MatAssemblyEnd(A[0],MAT_FINAL_ASSEMBLY));
52: PetscCall(MatCreate(PETSC_COMM_WORLD,&A[1]));
53: PetscCall(MatSetSizes(A[1],PETSC_DECIDE,PETSC_DECIDE,n,n));
54: PetscCall(MatSetFromOptions(A[1]));
55: PetscCall(MatGetOwnershipRange(A[1],&Istart,&Iend));
56: for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A[1],i,i,1.0,INSERT_VALUES));
57: PetscCall(MatAssemblyBegin(A[1],MAT_FINAL_ASSEMBLY));
58: PetscCall(MatAssemblyEnd(A[1],MAT_FINAL_ASSEMBLY));
60: PetscCall(MatCreate(PETSC_COMM_WORLD,&A[2]));
61: PetscCall(MatSetSizes(A[2],PETSC_DECIDE,PETSC_DECIDE,n,n));
62: PetscCall(MatSetFromOptions(A[2]));
63: PetscCall(MatGetOwnershipRange(A[1],&Istart,&Iend));
64: for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A[2],i,i,n/(PetscReal)(i+1),INSERT_VALUES));
65: PetscCall(MatAssemblyBegin(A[2],MAT_FINAL_ASSEMBLY));
66: PetscCall(MatAssemblyEnd(A[2],MAT_FINAL_ASSEMBLY));
68: /*
69: Functions: f0=-lambda, f1=1.0, f2=sqrt(lambda)
70: */
71: PetscCall(FNCreate(PETSC_COMM_WORLD,&f[0]));
72: PetscCall(FNSetType(f[0],FNRATIONAL));
73: coeffs[0] = -1.0; coeffs[1] = 0.0;
74: PetscCall(FNRationalSetNumerator(f[0],2,coeffs));
76: PetscCall(FNCreate(PETSC_COMM_WORLD,&f[1]));
77: PetscCall(FNSetType(f[1],FNRATIONAL));
78: coeffs[0] = 1.0;
79: PetscCall(FNRationalSetNumerator(f[1],1,coeffs));
81: PetscCall(FNCreate(PETSC_COMM_WORLD,&f[2]));
82: PetscCall(FNSetType(f[2],FNSQRT));
84: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
85: Create eigensolver and test interface functions
86: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
87: PetscCall(NEPCreate(PETSC_COMM_WORLD,&nep));
88: PetscCall(NEPSetSplitOperator(nep,3,A,f,SAME_NONZERO_PATTERN));
89: PetscCall(NEPGetSplitOperatorInfo(nep,&nterm,&mstr));
90: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Nonlinear function with %" PetscInt_FMT " terms, with %s nonzero pattern\n",nterm,MatStructures[mstr]));
91: PetscCall(NEPGetSplitOperatorTerm(nep,0,&B,&g));
92: PetscCall(MatView(B,NULL));
93: PetscCall(FNView(g,NULL));
95: PetscCall(NEPSetType(nep,NEPRII));
96: PetscCall(NEPGetType(nep,&type));
97: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Type set to %s\n",type));
98: PetscCall(NEPGetTwoSided(nep,&twoside));
99: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Two-sided flag = %s\n",twoside?"true":"false"));
101: PetscCall(NEPGetProblemType(nep,&ptype));
102: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Problem type before changing = %d",(int)ptype));
103: PetscCall(NEPSetProblemType(nep,NEP_RATIONAL));
104: PetscCall(NEPGetProblemType(nep,&ptype));
105: PetscCall(PetscPrintf(PETSC_COMM_WORLD," ... changed to %d.\n",(int)ptype));
107: PetscCall(NEPSetRefine(nep,NEP_REFINE_SIMPLE,1,1e-9,2,NEP_REFINE_SCHEME_EXPLICIT));
108: PetscCall(NEPGetRefine(nep,&refine,NULL,&tol,&its,&rscheme));
109: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Refinement: %s, tol=%g, its=%" PetscInt_FMT ", scheme=%s\n",NEPRefineTypes[refine],(double)tol,its,NEPRefineSchemes[rscheme]));
111: PetscCall(NEPSetTarget(nep,1.1));
112: PetscCall(NEPGetTarget(nep,&target));
113: PetscCall(NEPSetWhichEigenpairs(nep,NEP_TARGET_MAGNITUDE));
114: PetscCall(NEPGetWhichEigenpairs(nep,&which));
115: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Which = %d, target = %g\n",(int)which,(double)PetscRealPart(target)));
117: PetscCall(NEPSetDimensions(nep,1,12,PETSC_DEFAULT));
118: PetscCall(NEPGetDimensions(nep,&nev,&ncv,&mpd));
119: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Dimensions: nev=%" PetscInt_FMT ", ncv=%" PetscInt_FMT ", mpd=%" PetscInt_FMT "\n",nev,ncv,mpd));
121: PetscCall(NEPSetTolerances(nep,1.0e-6,200));
122: PetscCall(NEPGetTolerances(nep,&tol,&its));
123: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Tolerance = %.6f, max_its = %" PetscInt_FMT "\n",(double)tol,its));
125: PetscCall(NEPSetConvergenceTest(nep,NEP_CONV_ABS));
126: PetscCall(NEPGetConvergenceTest(nep,&conv));
127: PetscCall(NEPSetStoppingTest(nep,NEP_STOP_BASIC));
128: PetscCall(NEPGetStoppingTest(nep,&stop));
129: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Convergence test = %d, stopping test = %d\n",(int)conv,(int)stop));
131: PetscCall(PetscViewerAndFormatCreate(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_DEFAULT,&vf));
132: PetscCall(NEPMonitorSet(nep,(PetscErrorCode (*)(NEP,PetscInt,PetscInt,PetscScalar*,PetscScalar*,PetscReal*,PetscInt,void*))NEPMonitorFirst,vf,(PetscErrorCode (*)(void**))PetscViewerAndFormatDestroy));
133: PetscCall(NEPMonitorCancel(nep));
135: PetscCall(NEPGetDS(nep,&ds));
136: PetscCall(DSView(ds,NULL));
137: PetscCall(NEPSetFromOptions(nep));
139: PetscCall(NEPGetRG(nep,&rg));
140: PetscCall(RGView(rg,NULL));
142: PetscCall(NEPSolve(nep));
143: PetscCall(NEPGetConvergedReason(nep,&reason));
144: PetscCall(PetscPrintf(PETSC_COMM_WORLD," Finished - converged reason = %d\n",(int)reason));
146: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
147: Display solution and clean up
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149: PetscCall(NEPErrorView(nep,NEP_ERROR_RELATIVE,NULL));
150: PetscCall(NEPDestroy(&nep));
151: PetscCall(MatDestroy(&A[0]));
152: PetscCall(MatDestroy(&A[1]));
153: PetscCall(MatDestroy(&A[2]));
154: PetscCall(FNDestroy(&f[0]));
155: PetscCall(FNDestroy(&f[1]));
156: PetscCall(FNDestroy(&f[2]));
157: PetscCall(SlepcFinalize());
158: return 0;
159: }
161: /*TEST
163: test:
164: suffix: 1
165: args: -nep_view
166: filter: grep -v tolerance
168: TEST*/