Actual source code: test1.c
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-2012, Universitat Politecnica de Valencia, Spain
6: This file is part of SLEPc.
7:
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
28: int main( int argc, char **argv )
29: {
31: DS ds;
32: PetscScalar *A,*wr,*wi;
33: PetscReal re,im;
34: PetscInt i,j,n=10,ld;
35: PetscViewer viewer;
36: PetscBool verbose,extrarow;
38: SlepcInitialize(&argc,&argv,(char*)0,help);
39: PetscOptionsGetInt(PETSC_NULL,"-n",&n,PETSC_NULL);
40: PetscPrintf(PETSC_COMM_WORLD,"Solve a Dense System of type NHEP - dimension %D.\n",n);
41: PetscOptionsHasName(PETSC_NULL,"-verbose",&verbose);
42: PetscOptionsHasName(PETSC_NULL,"-extrarow",&extrarow);
44: /* Create DS object */
45: DSCreate(PETSC_COMM_WORLD,&ds);
46: DSSetType(ds,DSNHEP);
47: DSSetFromOptions(ds);
48: ld = n+2; /* test leading dimension larger than n */
49: DSAllocate(ds,ld);
50: DSSetDimensions(ds,n,PETSC_IGNORE,0,0);
51: DSSetExtraRow(ds,extrarow);
53: /* Set up viewer */
54: PetscViewerASCIIGetStdout(PETSC_COMM_WORLD,&viewer);
55: PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_INFO_DETAIL);
56: DSView(ds,viewer);
57: PetscViewerPopFormat(viewer);
58: if (verbose) {
59: PetscViewerPushFormat(viewer,PETSC_VIEWER_ASCII_MATLAB);
60: }
62: /* Fill with Grcar matrix */
63: DSGetArray(ds,DS_MAT_A,&A);
64: for (i=1;i<n;i++) A[i+(i-1)*ld]=-1.0;
65: for (j=0;j<4;j++) {
66: for (i=0;i<n-j;i++) A[i+(i+j)*ld]=1.0;
67: }
68: if (extrarow) { A[n+(n-1)*ld]=-1.0; }
69: DSRestoreArray(ds,DS_MAT_A,&A);
70: DSSetState(ds,DS_STATE_INTERMEDIATE);
71: if (verbose) {
72: PetscPrintf(PETSC_COMM_WORLD,"Initial - - - - - - - - -\n");
73: DSView(ds,viewer);
74: }
76: /* Solve */
77: PetscMalloc(n*sizeof(PetscScalar),&wr);
78: PetscMalloc(n*sizeof(PetscScalar),&wi);
79: DSSetEigenvalueComparison(ds,SlepcCompareLargestMagnitude,PETSC_NULL);
80: DSSolve(ds,wr,wi);
81: DSSort(ds,wr,wi,PETSC_NULL,PETSC_NULL,PETSC_NULL);
82: if (extrarow) { DSUpdateExtraRow(ds); }
83: if (verbose) {
84: PetscPrintf(PETSC_COMM_WORLD,"After solve - - - - - - - - -\n");
85: DSView(ds,viewer);
86: }
88: /* Print eigenvalues */
89: PetscPrintf(PETSC_COMM_WORLD,"Computed eigenvalues =\n",n);
90: for (i=0;i<n;i++) {
91: #if defined(PETSC_USE_COMPLEX)
92: re = PetscRealPart(wr[i]);
93: im = PetscImaginaryPart(wr[i]);
94: #else
95: re = wr[i];
96: im = wi[i];
97: #endif
98: if (PetscAbs(im)<1e-10) { PetscViewerASCIIPrintf(viewer," %.5F\n",re); }
99: else { PetscViewerASCIIPrintf(viewer," %.5F%+.5Fi\n",re,im); }
100: }
102: PetscFree(wr);
103: PetscFree(wi);
104: DSDestroy(&ds);
105: SlepcFinalize();
106: return 0;
107: }