Actual source code: test8.c
slepc-3.17.1 2022-04-11
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: PetscComplex *eigs,eval;
23: PetscInt n=6,i,Istart,Iend,nconv,its;
24: PetscReal errest;
25: PetscBool checkfile;
26: char filename[PETSC_MAX_PATH_LEN];
27: PetscViewer viewer;
29: SlepcInitialize(&argc,&argv,(char*)0,help);
30: PetscPrintf(PETSC_COMM_WORLD,"\nDiagonal Nonlinear Eigenproblem, n=%" PetscInt_FMT "\n\n",n);
32: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
33: Generate the matrices
34: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
36: MatCreate(PETSC_COMM_WORLD,&A[0]);
37: MatSetSizes(A[0],PETSC_DECIDE,PETSC_DECIDE,n,n);
38: MatSetFromOptions(A[0]);
39: MatSetUp(A[0]);
40: MatGetOwnershipRange(A[0],&Istart,&Iend);
41: for (i=Istart;i<Iend;i++) MatSetValue(A[0],i,i,i+1,INSERT_VALUES);
42: MatAssemblyBegin(A[0],MAT_FINAL_ASSEMBLY);
43: MatAssemblyEnd(A[0],MAT_FINAL_ASSEMBLY);
45: MatCreate(PETSC_COMM_WORLD,&A[1]);
46: MatSetSizes(A[1],PETSC_DECIDE,PETSC_DECIDE,n,n);
47: MatSetFromOptions(A[1]);
48: MatSetUp(A[1]);
49: for (i=Istart;i<Iend;i++) MatSetValue(A[1],i,i,-1.5,INSERT_VALUES);
50: MatAssemblyBegin(A[1],MAT_FINAL_ASSEMBLY);
51: MatAssemblyEnd(A[1],MAT_FINAL_ASSEMBLY);
53: MatCreate(PETSC_COMM_WORLD,&A[2]);
54: MatSetSizes(A[2],PETSC_DECIDE,PETSC_DECIDE,n,n);
55: MatSetFromOptions(A[2]);
56: MatSetUp(A[2]);
57: for (i=Istart;i<Iend;i++) MatSetValue(A[2],i,i,-1.0/(i+1),INSERT_VALUES);
58: MatAssemblyBegin(A[2],MAT_FINAL_ASSEMBLY);
59: MatAssemblyEnd(A[2],MAT_FINAL_ASSEMBLY);
61: /*
62: Functions: f0=1.0, f1=lambda, f2=lambda^2
63: */
64: FNCreate(PETSC_COMM_WORLD,&f[0]);
65: FNSetType(f[0],FNRATIONAL);
66: coeffs[0] = 1.0;
67: FNRationalSetNumerator(f[0],1,coeffs);
69: FNCreate(PETSC_COMM_WORLD,&f[1]);
70: FNSetType(f[1],FNRATIONAL);
71: coeffs[0] = 1.0; coeffs[1] = 0.0;
72: FNRationalSetNumerator(f[1],2,coeffs);
74: FNCreate(PETSC_COMM_WORLD,&f[2]);
75: FNSetType(f[2],FNRATIONAL);
76: coeffs[0] = 1.0; coeffs[1] = 0.0; coeffs[2] = 0.0;
77: FNRationalSetNumerator(f[2],3,coeffs);
79: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
80: Create the NEP solver
81: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
82: NEPCreate(PETSC_COMM_WORLD,&nep);
83: PetscObjectSetName((PetscObject)nep,"nep");
84: NEPSetSplitOperator(nep,3,A,f,SAME_NONZERO_PATTERN);
85: NEPSetTarget(nep,1.1);
86: NEPSetWhichEigenpairs(nep,NEP_TARGET_MAGNITUDE);
87: NEPSetFromOptions(nep);
89: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
90: Solve the eigensystem and display solution
91: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
92: NEPSolve(nep);
93: NEPGetConverged(nep,&nconv);
94: NEPGetIterationNumber(nep,&its);
95: PetscPrintf(PETSC_COMM_WORLD," %" PetscInt_FMT " converged eigenpairs after %" PetscInt_FMT " iterations\n",nconv,its);
96: if (nconv>0) {
97: MatCreateVecs(A[0],&xr,&xi);
98: NEPGetEigenpair(nep,0,&kr,&ki,xr,xi);
99: VecDestroy(&xr);
100: VecDestroy(&xi);
101: NEPGetErrorEstimate(nep,0,&errest);
102: }
103: NEPErrorView(nep,NEP_ERROR_BACKWARD,NULL);
105: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
106: Check file containing the eigenvalues
107: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
108: PetscOptionsGetString(NULL,NULL,"-checkfile",filename,sizeof(filename),&checkfile);
109: if (checkfile) {
110: PetscMalloc1(nconv,&eigs);
111: PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer);
112: PetscViewerBinaryRead(viewer,eigs,nconv,NULL,PETSC_COMPLEX);
113: PetscViewerDestroy(&viewer);
114: for (i=0;i<nconv;i++) {
115: NEPGetEigenpair(nep,i,&kr,&ki,NULL,NULL);
116: #if defined(PETSC_USE_COMPLEX)
117: eval = kr;
118: #else
119: eval = PetscCMPLX(kr,ki);
120: #endif
122: }
123: PetscFree(eigs);
124: }
126: NEPDestroy(&nep);
127: MatDestroy(&A[0]);
128: MatDestroy(&A[1]);
129: MatDestroy(&A[2]);
130: FNDestroy(&f[0]);
131: FNDestroy(&f[1]);
132: FNDestroy(&f[2]);
133: SlepcFinalize();
134: return 0;
135: }
137: /*TEST
139: test:
140: suffix: 1
141: 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
142: 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"
143: requires: double
145: test:
146: suffix: 2
147: args: -nep_type rii -nep_target -.5 -nep_rii_hermitian -nep_monitor -nep_view_values ::ascii_matlab
148: filter: sed -e "s/[+-][0-9]\.[0-9]*e-[0-9]*i//" -e "s/([0-9]\.[0-9]*e[+-]\([0-9]*\))/(removed)/g"
149: requires: double
151: test:
152: suffix: 3
153: args: -nep_type slp -nep_nev 4 -nep_view_values binary:myvalues.bin -checkfile myvalues.bin -nep_error_relative ::ascii_matlab
154: filter: sed -e "s/[0-9]\.[0-9]*e[+-]\([0-9]*\)/removed/g"
155: requires: double
157: test:
158: suffix: 4
159: 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
160: requires: x double
162: TEST*/