Actual source code: test8.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 view and monitor functionality.\n\n";
13: #include <slepcnep.h>
15: int main(int argc,char **argv)
16: {
17: Mat A[3];
18: FN f[3];
19: NEP nep;
20: Vec xr,xi;
21: PetscScalar kr,ki,coeffs[3];
22: PetscInt n=6,i,Istart,Iend,nconv,its;
23: PetscReal errest;
24: PetscBool checkfile;
25: char filename[PETSC_MAX_PATH_LEN];
26: PetscViewer viewer;
28: PetscFunctionBeginUser;
29: PetscCall(SlepcInitialize(&argc,&argv,(char*)0,help));
30: PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nDiagonal Nonlinear Eigenproblem, n=%" PetscInt_FMT "\n\n",n));
32: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
33: Generate the matrices
34: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
36: PetscCall(MatCreate(PETSC_COMM_WORLD,&A[0]));
37: PetscCall(MatSetSizes(A[0],PETSC_DECIDE,PETSC_DECIDE,n,n));
38: PetscCall(MatSetFromOptions(A[0]));
39: PetscCall(MatGetOwnershipRange(A[0],&Istart,&Iend));
40: for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A[0],i,i,i+1,INSERT_VALUES));
41: PetscCall(MatAssemblyBegin(A[0],MAT_FINAL_ASSEMBLY));
42: PetscCall(MatAssemblyEnd(A[0],MAT_FINAL_ASSEMBLY));
44: PetscCall(MatCreate(PETSC_COMM_WORLD,&A[1]));
45: PetscCall(MatSetSizes(A[1],PETSC_DECIDE,PETSC_DECIDE,n,n));
46: PetscCall(MatSetFromOptions(A[1]));
47: for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A[1],i,i,-1.5,INSERT_VALUES));
48: PetscCall(MatAssemblyBegin(A[1],MAT_FINAL_ASSEMBLY));
49: PetscCall(MatAssemblyEnd(A[1],MAT_FINAL_ASSEMBLY));
51: PetscCall(MatCreate(PETSC_COMM_WORLD,&A[2]));
52: PetscCall(MatSetSizes(A[2],PETSC_DECIDE,PETSC_DECIDE,n,n));
53: PetscCall(MatSetFromOptions(A[2]));
54: for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(A[2],i,i,-1.0/(i+1),INSERT_VALUES));
55: PetscCall(MatAssemblyBegin(A[2],MAT_FINAL_ASSEMBLY));
56: PetscCall(MatAssemblyEnd(A[2],MAT_FINAL_ASSEMBLY));
58: /*
59: Functions: f0=1.0, f1=lambda, f2=lambda^2
60: */
61: PetscCall(FNCreate(PETSC_COMM_WORLD,&f[0]));
62: PetscCall(FNSetType(f[0],FNRATIONAL));
63: coeffs[0] = 1.0;
64: PetscCall(FNRationalSetNumerator(f[0],1,coeffs));
66: PetscCall(FNCreate(PETSC_COMM_WORLD,&f[1]));
67: PetscCall(FNSetType(f[1],FNRATIONAL));
68: coeffs[0] = 1.0; coeffs[1] = 0.0;
69: PetscCall(FNRationalSetNumerator(f[1],2,coeffs));
71: PetscCall(FNCreate(PETSC_COMM_WORLD,&f[2]));
72: PetscCall(FNSetType(f[2],FNRATIONAL));
73: coeffs[0] = 1.0; coeffs[1] = 0.0; coeffs[2] = 0.0;
74: PetscCall(FNRationalSetNumerator(f[2],3,coeffs));
76: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
77: Create the NEP solver
78: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
79: PetscCall(NEPCreate(PETSC_COMM_WORLD,&nep));
80: PetscCall(PetscObjectSetName((PetscObject)nep,"nep"));
81: PetscCall(NEPSetSplitOperator(nep,3,A,f,SAME_NONZERO_PATTERN));
82: PetscCall(NEPSetTarget(nep,1.1));
83: PetscCall(NEPSetWhichEigenpairs(nep,NEP_TARGET_MAGNITUDE));
84: PetscCall(NEPSetFromOptions(nep));
86: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
87: Solve the eigensystem and display solution
88: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
89: PetscCall(NEPSolve(nep));
90: PetscCall(NEPGetConverged(nep,&nconv));
91: PetscCall(NEPGetIterationNumber(nep,&its));
92: PetscCall(PetscPrintf(PETSC_COMM_WORLD," %" PetscInt_FMT " converged eigenpairs after %" PetscInt_FMT " iterations\n",nconv,its));
93: if (nconv>0) {
94: PetscCall(MatCreateVecs(A[0],&xr,&xi));
95: PetscCall(NEPGetEigenpair(nep,0,&kr,&ki,xr,xi));
96: PetscCall(VecDestroy(&xr));
97: PetscCall(VecDestroy(&xi));
98: PetscCall(NEPGetErrorEstimate(nep,0,&errest));
99: }
100: PetscCall(NEPErrorView(nep,NEP_ERROR_BACKWARD,NULL));
102: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
103: Check file containing the eigenvalues
104: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
105: PetscCall(PetscOptionsGetString(NULL,NULL,"-checkfile",filename,sizeof(filename),&checkfile));
106: if (checkfile) {
107: #if defined(PETSC_HAVE_COMPLEX)
108: PetscComplex *eigs,eval;
109: PetscCall(PetscMalloc1(nconv,&eigs));
110: PetscCall(PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer));
111: PetscCall(PetscViewerBinaryRead(viewer,eigs,nconv,NULL,PETSC_COMPLEX));
112: PetscCall(PetscViewerDestroy(&viewer));
113: for (i=0;i<nconv;i++) {
114: PetscCall(NEPGetEigenpair(nep,i,&kr,&ki,NULL,NULL));
115: #if defined(PETSC_USE_COMPLEX)
116: eval = kr;
117: #else
118: eval = PetscCMPLX(kr,ki);
119: #endif
120: PetscCheck(eval==eigs[i],PETSC_COMM_WORLD,PETSC_ERR_FILE_UNEXPECTED,"Eigenvalues in the file do not match");
121: }
122: PetscCall(PetscFree(eigs));
123: #else
124: SETERRQ(PETSC_COMM_WORLD,PETSC_ERR_SUP,"The -checkfile option requires C99 complex numbers");
125: #endif
126: }
128: PetscCall(NEPDestroy(&nep));
129: PetscCall(MatDestroy(&A[0]));
130: PetscCall(MatDestroy(&A[1]));
131: PetscCall(MatDestroy(&A[2]));
132: PetscCall(FNDestroy(&f[0]));
133: PetscCall(FNDestroy(&f[1]));
134: PetscCall(FNDestroy(&f[2]));
135: PetscCall(SlepcFinalize());
136: return 0;
137: }
139: /*TEST
141: test:
142: suffix: 1
143: args: -nep_type slp -nep_target -.5 -nep_error_backward ::ascii_info_detail -nep_view_values -nep_error_absolute ::ascii_matlab -nep_monitor_all -nep_converged_reason -nep_view
144: filter: grep -v "tolerance" | grep -v "problem type" | sed -e "s/[+-]0\.0*i//g" -e "s/+0i//" -e "s/[+-][0-9]\.[0-9]*e-[0-9]*i//g" -e "s/[0-9]\.[0-9]*e[+-]\([0-9]*\)/removed/g"
145: requires: double
147: test:
148: suffix: 2
149: args: -nep_type rii -nep_target -.5 -nep_rii_hermitian -nep_monitor -nep_view_values ::ascii_matlab
150: filter: sed -e "s/[+-][0-9]\.[0-9]*e-[0-9]*i//" -e "s/([0-9]\.[0-9]*e[+-]\([0-9]*\))/(removed)/g"
151: requires: double
153: test:
154: suffix: 3
155: args: -nep_type slp -nep_nev 4 -nep_view_values binary:myvalues.bin -checkfile myvalues.bin -nep_error_relative ::ascii_matlab
156: filter: sed -e "s/[0-9]\.[0-9]*e[+-]\([0-9]*\)/removed/g"
157: requires: double c99_complex
159: test:
160: suffix: 4
161: args: -nep_type slp -nep_nev 4 -nep_monitor draw::draw_lg -nep_monitor_all draw::draw_lg -nep_view_values draw -draw_save myeigen.ppm -draw_virtual
162: requires: x double
164: TEST*/