Actual source code: test34.c
slepc-3.15.1 2021-05-28
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-2021, 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 interface to external package PRIMME.\n\n"
12: "This is based on ex3.c. The command line options are:\n"
13: " -n <n>, where <n> = number of grid subdivisions in x dimension.\n"
14: " -m <m>, where <m> = number of grid subdivisions in y dimension.\n\n";
16: #include <slepceps.h>
18: int main(int argc,char **argv)
19: {
20: Mat A; /* matrix */
21: EPS eps; /* eigenproblem solver context */
22: ST st; /* spectral transformation context */
23: KSP ksp;
24: PC pc;
25: PetscInt N,n=35,m,Istart,Iend,II,i,j,bs;
26: PetscBool flag;
27: EPSPRIMMEMethod meth;
28: PetscErrorCode ierr;
30: SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
32: PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
33: PetscOptionsGetInt(NULL,NULL,"-m",&m,&flag);
34: if (!flag) m=n;
35: N = n*m;
36: PetscPrintf(PETSC_COMM_WORLD,"\nStandard eigenproblem with PRIMME, N=%D (%Dx%D grid)\n\n",N,n,m);
38: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
39: Compute the matrices that define the eigensystem, Ax=kBx
40: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
42: MatCreate(PETSC_COMM_WORLD,&A);
43: MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N);
44: MatSetFromOptions(A);
45: MatSetUp(A);
47: MatGetOwnershipRange(A,&Istart,&Iend);
48: for (II=Istart;II<Iend;II++) {
49: i = II/n; j = II-i*n;
50: if (i>0) { MatSetValue(A,II,II-n,-1.0,INSERT_VALUES); }
51: if (i<m-1) { MatSetValue(A,II,II+n,-1.0,INSERT_VALUES); }
52: if (j>0) { MatSetValue(A,II,II-1,-1.0,INSERT_VALUES); }
53: if (j<n-1) { MatSetValue(A,II,II+1,-1.0,INSERT_VALUES); }
54: MatSetValue(A,II,II,4.0,INSERT_VALUES);
55: }
57: MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
58: MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
60: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
61: Create the eigensolver and set various options
62: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
64: EPSCreate(PETSC_COMM_WORLD,&eps);
65: EPSSetOperators(eps,A,NULL);
66: EPSSetProblemType(eps,EPS_HEP);
67: EPSSetType(eps,EPSPRIMME);
69: /*
70: Set several options
71: */
72: EPSSetWhichEigenpairs(eps,EPS_SMALLEST_REAL);
73: EPSGetST(eps,&st);
74: STSetType(st,STPRECOND);
75: STGetKSP(st,&ksp);
76: KSPGetPC(ksp,&pc);
77: KSPSetType(ksp,KSPPREONLY);
78: PCSetType(pc,PCICC);
80: EPSPRIMMESetBlockSize(eps,4);
81: EPSPRIMMESetMethod(eps,EPS_PRIMME_GD_OLSEN_PLUSK);
82: EPSSetFromOptions(eps);
84: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
85: Compute eigenvalues and display info
86: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
88: EPSSolve(eps);
89: EPSPRIMMEGetBlockSize(eps,&bs);
90: EPSPRIMMEGetMethod(eps,&meth);
91: PetscPrintf(PETSC_COMM_WORLD," PRIMME: using block size %D, method %s\n",bs,EPSPRIMMEMethods[meth]);
93: EPSErrorView(eps,EPS_ERROR_ABSOLUTE,NULL);
95: EPSDestroy(&eps);
96: MatDestroy(&A);
97: SlepcFinalize();
98: return ierr;
99: }
101: /*TEST
103: build:
104: requires: primme
106: testset:
107: args: -eps_nev 4
108: requires: primme
109: output_file: output/test34_1.out
110: test:
111: suffix: 1
112: test:
113: suffix: 2
114: args: -st_pc_type bjacobi -eps_target 0.01 -eps_target_real -eps_refined
115: nsize: 2
116: test:
117: suffix: 3
118: args: -eps_smallest_magnitude -eps_harmonic
120: TEST*/