Actual source code: test5.c
slepc-3.9.1 2018-05-02
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-2018, 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 SVD view and monitor functionality.\n\n";
13: #include <slepcsvd.h>
15: int main(int argc,char **argv)
16: {
17: Mat A;
18: SVD svd;
19: PetscInt n=6,Istart,Iend,i;
22: SlepcInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr;
23: PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
24: PetscPrintf(PETSC_COMM_WORLD,"\nSVD of diagonal matrix, n=%D\n\n",n);
26: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
27: Generate the matrix
28: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
29: MatCreate(PETSC_COMM_WORLD,&A);
30: MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);
31: MatSetFromOptions(A);
32: MatSetUp(A);
33: MatGetOwnershipRange(A,&Istart,&Iend);
34: for (i=Istart;i<Iend;i++) {
35: MatSetValue(A,i,i,i+1,INSERT_VALUES);
36: }
37: MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
38: MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
40: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
41: Create the SVD solver
42: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
43: SVDCreate(PETSC_COMM_WORLD,&svd);
44: PetscObjectSetName((PetscObject)svd,"svd");
45: SVDSetOperator(svd,A);
46: SVDSetFromOptions(svd);
48: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
49: Compute the singular triplets and display solution
50: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
51: SVDSolve(svd);
52: SVDErrorView(svd,SVD_ERROR_RELATIVE,NULL);
53: SVDDestroy(&svd);
54: MatDestroy(&A);
55: SlepcFinalize();
56: return ierr;
57: }