Actual source code: test5.c
slepc-3.17.1 2022-04-11
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-, 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: PetscReal *sigma,sval;
20: PetscInt n=6,Istart,Iend,i,nconv;
21: PetscBool checkfile;
22: char filename[PETSC_MAX_PATH_LEN];
23: PetscViewer viewer;
25: SlepcInitialize(&argc,&argv,(char*)0,help);
26: PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
27: PetscPrintf(PETSC_COMM_WORLD,"\nSVD of diagonal matrix, n=%" PetscInt_FMT "\n\n",n);
29: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
30: Generate the matrix
31: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
32: MatCreate(PETSC_COMM_WORLD,&A);
33: MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n);
34: MatSetFromOptions(A);
35: MatSetUp(A);
36: MatGetOwnershipRange(A,&Istart,&Iend);
37: for (i=Istart;i<Iend;i++) MatSetValue(A,i,i,i+1,INSERT_VALUES);
38: MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
39: MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
41: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
42: Create the SVD solver
43: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
44: SVDCreate(PETSC_COMM_WORLD,&svd);
45: PetscObjectSetName((PetscObject)svd,"svd");
46: SVDSetOperators(svd,A,NULL);
47: SVDSetFromOptions(svd);
49: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
50: Compute the singular triplets and display solution
51: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
52: SVDSolve(svd);
53: SVDErrorView(svd,SVD_ERROR_RELATIVE,NULL);
55: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
56: Check file containing the singular values
57: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
58: PetscOptionsGetString(NULL,NULL,"-checkfile",filename,sizeof(filename),&checkfile);
59: if (checkfile) {
60: SVDGetConverged(svd,&nconv);
61: PetscMalloc1(nconv,&sigma);
62: PetscViewerBinaryOpen(PETSC_COMM_WORLD,filename,FILE_MODE_READ,&viewer);
63: PetscViewerBinaryRead(viewer,sigma,nconv,NULL,PETSC_REAL);
64: PetscViewerDestroy(&viewer);
65: for (i=0;i<nconv;i++) {
66: SVDGetSingularTriplet(svd,i,&sval,NULL,NULL);
68: }
69: PetscFree(sigma);
70: }
72: SVDDestroy(&svd);
73: MatDestroy(&A);
74: SlepcFinalize();
75: return 0;
76: }
78: /*TEST
80: test:
81: suffix: 1
82: args: -svd_error_relative ::ascii_info_detail -svd_view_values -svd_monitor_conv -svd_error_absolute ::ascii_matlab -svd_monitor_all -svd_converged_reason -svd_view
83: filter: grep -v "tolerance" | grep -v "problem type" | sed -e "s/1.999999/2.000000/" | sed -e "s/2.000001/2.000000/" | sed -e "s/[0-9]\.[0-9]*e-\([0-9]*\)/removed/g"
84: requires: !single
86: test:
87: suffix: 2
88: args: -svd_nsv 4 -svd_view_values binary:myvalues.bin -checkfile myvalues.bin
89: requires: double
91: test:
92: suffix: 3
93: args: -svd_type trlanczos -svd_error_relative ::ascii_info_detail -svd_view_values -svd_monitor_conv -svd_error_absolute ::ascii_matlab -svd_monitor_all -svd_converged_reason -svd_view
94: filter: grep -v "tolerance" | grep -v "problem type" | sed -e "s/1.999999/2.000000/" | sed -e "s/2.000001/2.000000/" | sed -e "s/[0-9]\.[0-9]*e-\([0-9]*\)/removed/g"
95: requires: !single
97: test:
98: suffix: 4
99: args: -svd_monitor draw::draw_lg -svd_monitor_all draw::draw_lg -svd_view_values draw -draw_save mysingu.ppm -draw_virtual
100: requires: x !single
102: TEST*/