Actual source code: test14.c
slepc-3.11.2 2019-07-30
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-2019, 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 EPS interface functions.\n\n";
13: #include <slepceps.h>
15: int main(int argc,char **argv)
16: {
17: Mat A,B; /* problem matrix */
18: EPS eps; /* eigenproblem solver context */
19: ST st;
20: KSP ksp;
21: DS ds;
22: PetscReal cut,tol;
23: PetscScalar target;
24: PetscInt n=20,i,its,nev,ncv,mpd,Istart,Iend;
25: PetscBool flg,pur,track;
26: EPSConvergedReason reason;
27: EPSType type;
28: EPSExtraction extr;
29: EPSBalance bal;
30: EPSWhich which;
31: EPSConv conv;
32: EPSStop stop;
33: EPSProblemType ptype;
34: PetscErrorCode ierr;
35: PetscViewerAndFormat *vf;
37: SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
38: PetscPrintf(PETSC_COMM_WORLD,"\nDiagonal Eigenproblem, n=%D\n\n",n);
40: MatCreate(PETSC_COMM_WORLD,&A);
41: MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);
42: MatSetFromOptions(A);
43: MatSetUp(A);
44: MatGetOwnershipRange(A,&Istart,&Iend);
45: for (i=Istart;i<Iend;i++) {
46: MatSetValue(A,i,i,i+1,INSERT_VALUES);
47: }
48: MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
49: MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
51: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
52: Create eigensolver and test interface functions
53: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
54: EPSCreate(PETSC_COMM_WORLD,&eps);
55: EPSSetOperators(eps,A,NULL);
56: EPSGetOperators(eps,&B,NULL);
57: MatView(B,NULL);
59: EPSSetType(eps,EPSKRYLOVSCHUR);
60: EPSGetType(eps,&type);
61: PetscPrintf(PETSC_COMM_WORLD," Type set to %s\n",type);
63: EPSGetProblemType(eps,&ptype);
64: PetscPrintf(PETSC_COMM_WORLD," Problem type before changing = %d",(int)ptype);
65: EPSSetProblemType(eps,EPS_HEP);
66: EPSGetProblemType(eps,&ptype);
67: PetscPrintf(PETSC_COMM_WORLD," ... changed to %d.",(int)ptype);
68: EPSIsGeneralized(eps,&flg);
69: if (flg) { PetscPrintf(PETSC_COMM_WORLD," generalized"); }
70: EPSIsHermitian(eps,&flg);
71: if (flg) { PetscPrintf(PETSC_COMM_WORLD," hermitian"); }
72: EPSIsPositive(eps,&flg);
73: if (flg) { PetscPrintf(PETSC_COMM_WORLD," positive"); }
75: EPSGetExtraction(eps,&extr);
76: PetscPrintf(PETSC_COMM_WORLD,"\n Extraction before changing = %d",(int)extr);
77: EPSSetExtraction(eps,EPS_HARMONIC);
78: EPSGetExtraction(eps,&extr);
79: PetscPrintf(PETSC_COMM_WORLD," ... changed to %d\n",(int)extr);
81: EPSSetBalance(eps,EPS_BALANCE_ONESIDE,8,1e-6);
82: EPSGetBalance(eps,&bal,&its,&cut);
83: PetscPrintf(PETSC_COMM_WORLD," Balance: %s, its=%D, cutoff=%g\n",EPSBalanceTypes[bal],its,(double)cut);
85: EPSSetPurify(eps,PETSC_FALSE);
86: EPSGetPurify(eps,&pur);
87: PetscPrintf(PETSC_COMM_WORLD," Eigenvector purification: %s\n",pur?"on":"off");
88: EPSGetTrackAll(eps,&track);
90: EPSSetTarget(eps,4.8);
91: EPSGetTarget(eps,&target);
92: EPSSetWhichEigenpairs(eps,EPS_TARGET_MAGNITUDE);
93: EPSGetWhichEigenpairs(eps,&which);
94: PetscPrintf(PETSC_COMM_WORLD," Which = %d, target = %g\n",(int)which,(double)PetscRealPart(target));
96: EPSSetDimensions(eps,4,PETSC_DEFAULT,PETSC_DEFAULT);
97: EPSGetDimensions(eps,&nev,&ncv,&mpd);
98: PetscPrintf(PETSC_COMM_WORLD," Dimensions: nev=%D, ncv=%D, mpd=%D\n",nev,ncv,mpd);
100: EPSSetTolerances(eps,2.2e-4,200);
101: EPSGetTolerances(eps,&tol,&its);
102: PetscPrintf(PETSC_COMM_WORLD," Tolerance = %.5f, max_its = %D\n",(double)tol,its);
104: EPSSetConvergenceTest(eps,EPS_CONV_ABS);
105: EPSGetConvergenceTest(eps,&conv);
106: EPSSetStoppingTest(eps,EPS_STOP_BASIC);
107: EPSGetStoppingTest(eps,&stop);
108: PetscPrintf(PETSC_COMM_WORLD," Convergence test = %d, stopping test = %d\n",(int)conv,(int)stop);
110: PetscViewerAndFormatCreate(PETSC_VIEWER_STDOUT_WORLD,PETSC_VIEWER_DEFAULT,&vf);
111: EPSMonitorSet(eps,(PetscErrorCode (*)(EPS,PetscInt,PetscInt,PetscScalar*,PetscScalar*,PetscReal*,PetscInt,void*))EPSMonitorFirst,vf,(PetscErrorCode (*)(void**))PetscViewerAndFormatDestroy);
112: EPSMonitorCancel(eps);
114: EPSGetST(eps,&st);
115: STGetKSP(st,&ksp);
116: KSPSetTolerances(ksp,1e-8,1e-35,PETSC_DEFAULT,PETSC_DEFAULT);
117: STView(st,NULL);
118: EPSGetDS(eps,&ds);
119: DSView(ds,NULL);
121: EPSSetFromOptions(eps);
122: EPSSolve(eps);
123: EPSGetConvergedReason(eps,&reason);
124: EPSGetIterationNumber(eps,&its);
125: PetscPrintf(PETSC_COMM_WORLD," Finished - converged reason = %d, its=%D\n",(int)reason,its);
127: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
128: Display solution and clean up
129: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
130: EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL);
131: EPSDestroy(&eps);
132: MatDestroy(&A);
133: SlepcFinalize();
134: return ierr;
135: }
137: /*TEST
139: test:
140: suffix: 1
141: args: -eps_ncv 14
143: TEST*/