Actual source code: test1.c
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-2013, Universitat Politecnica de Valencia, Spain
6: This file is part of SLEPc.
8: SLEPc is free software: you can redistribute it and/or modify it under the
9: terms of version 3 of the GNU Lesser General Public License as published by
10: the Free Software Foundation.
12: SLEPc is distributed in the hope that it will be useful, but WITHOUT ANY
13: WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14: FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
15: more details.
17: You should have received a copy of the GNU Lesser General Public License
18: along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
19: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
20: */
22: static char help[] = "Test DSNHEP.\n\n";
24: #include <slepcds.h>
25: #include <slepc-private/dsimpl.h> /* for the definition of SlepcCompare* */
29: int main(int argc,char **argv)
30: {
32: DS ds;
33: PetscScalar *A,*wr,*wi;
34: PetscReal re,im;
35: PetscInt i,j,n=10,ld;
36: PetscViewer viewer;
37: PetscBool verbose,extrarow;
39: SlepcInitialize(&argc,&argv,(char*)0,help);
40: PetscOptionsGetInt(NULL,"-n",&n,NULL);
41: PetscPrintf(PETSC_COMM_WORLD,"Solve a Dense System of type NHEP - dimension %D.\n",n);
42: PetscOptionsHasName(NULL,"-verbose",&verbose);
43: PetscOptionsHasName(NULL,"-extrarow",&extrarow);
45: /* Create DS object */
46: DSCreate(PETSC_COMM_WORLD,&ds);
47: DSSetType(ds,DSNHEP);
48: DSSetFromOptions(ds);
49: ld = n+2; /* test leading dimension larger than n */
50: DSAllocate(ds,ld);
51: DSSetDimensions(ds,n,0,0,0);
52: DSSetExtraRow(ds,extrarow);
54: /* Set up viewer */
55: PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&viewer);
56: PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_INFO_DETAIL);
57: DSView(ds,viewer);
58: PetscViewerPopFormat(viewer);
59: if (verbose) {
60: PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_MATLAB);
61: }
63: /* Fill with Grcar matrix */
64: DSGetArray(ds,DS_MAT_A,&A);
65: for (i=1;i<n;i++) A[i+(i-1)*ld]=-1.0;
66: for (j=0;j<4;j++) {
67: for (i=0;i<n-j;i++) A[i+(i+j)*ld]=1.0;
68: }
69: if (extrarow) A[n+(n-1)*ld]=-1.0;
70: DSRestoreArray(ds,DS_MAT_A,&A);
71: DSSetState(ds,DS_STATE_INTERMEDIATE);
72: if (verbose) {
73: PetscPrintf(PETSC_COMM_WORLD,"Initial - - - - - - - - -\n");
74: DSView(ds,viewer);
75: }
77: /* Solve */
78: PetscMalloc(n*sizeof(PetscScalar),&wr);
79: PetscMalloc(n*sizeof(PetscScalar),&wi);
80: DSSetEigenvalueComparison(ds,SlepcCompareLargestMagnitude,NULL);
81: DSSolve(ds,wr,wi);
82: DSSort(ds,wr,wi,NULL,NULL,NULL);
83: if (extrarow) { DSUpdateExtraRow(ds); }
84: if (verbose) {
85: PetscPrintf(PETSC_COMM_WORLD,"After solve - - - - - - - - -\n");
86: DSView(ds,viewer);
87: }
89: /* Print eigenvalues */
90: PetscPrintf(PETSC_COMM_WORLD,"Computed eigenvalues =\n",n);
91: for (i=0;i<n;i++) {
92: #if defined(PETSC_USE_COMPLEX)
93: re = PetscRealPart(wr[i]);
94: im = PetscImaginaryPart(wr[i]);
95: #else
96: re = wr[i];
97: im = wi[i];
98: #endif
99: if (PetscAbs(im)<1e-10) {
100: PetscViewerASCIIPrintf(viewer," %.5F\n",re);
101: } else {
102: PetscViewerASCIIPrintf(viewer," %.5F%+.5Fi\n",re,im);
103: }
104: }
106: PetscFree(wr);
107: PetscFree(wi);
108: DSDestroy(&ds);
109: SlepcFinalize();
110: return 0;
111: }