GCC Code Coverage Report

Directory: ./
File: src/svd/tests/test7.c
Date: 2025-11-19 04:19:03
Exec Total Coverage
Lines: 54 54 100.0%
Functions: 1 1 100.0%
Branches: 158 248 63.7%
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1 /*
2 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3 SLEPc - Scalable Library for Eigenvalue Problem Computations
4 Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain
5
6 This file is part of SLEPc.
7 SLEPc is distributed under a 2-clause BSD license (see LICENSE).
8 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9 */
10
11 static char help[] = "SVD via the cyclic matrix with a user-provided EPS.\n\n"
12 "The command line options are:\n"
13 " -m <m>, where <m> = matrix rows.\n"
14 " -n <n>, where <n> = matrix columns (defaults to m+2).\n\n";
15
16 #include <slepcsvd.h>
17
18 /*
19 This example computes the singular values of a rectangular bidiagonal matrix
20
21 | 1 2 |
22 | 1 2 |
23 | 1 2 |
24 A = | . . |
25 | . . |
26 | 1 2 |
27 | 1 2 |
28 */
29
30 14 int main(int argc,char **argv)
31 {
32 14 Mat A;
33 14 SVD svd;
34 14 EPS eps;
35 14 ST st;
36 14 KSP ksp;
37 14 PC pc;
38 14 PetscInt m=20,n,Istart,Iend,i,col[2];
39 14 PetscScalar value[] = { 1, 2 };
40 14 PetscBool flg,expmat;
41
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 14 PetscFunctionBeginUser;
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 14 PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
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 14 PetscCall(PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL));
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 14 PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,&flg));
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 14 if (!flg) n=m+2;
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 14 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nRectangular bidiagonal matrix, m=%" PetscInt_FMT " n=%" PetscInt_FMT "\n\n",m,n));
49
50 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
51 Generate the matrix
52 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
53
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 14 PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
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 14 PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,m,n));
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 14 PetscCall(MatSetFromOptions(A));
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 14 PetscCall(MatGetOwnershipRange(A,&Istart,&Iend));
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 294 for (i=Istart;i<Iend;i++) {
59 280 col[0]=i; col[1]=i+1;
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 280 if (i<n-1) PetscCall(MatSetValues(A,1,&i,2,col,value,INSERT_VALUES));
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 280 else if (i==n-1) PetscCall(MatSetValue(A,i,col[0],value[0],INSERT_VALUES));
62 }
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 14 PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
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 14 PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));
65
66 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
67 Create a standalone EPS with appropriate settings
68 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
69
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 14 PetscCall(EPSCreate(PETSC_COMM_WORLD,&eps));
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 14 PetscCall(EPSSetWhichEigenpairs(eps,EPS_TARGET_MAGNITUDE));
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 14 PetscCall(EPSSetTarget(eps,1.0));
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 14 PetscCall(EPSGetST(eps,&st));
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 14 PetscCall(STSetType(st,STSINVERT));
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 14 PetscCall(STSetShift(st,1.01));
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 14 PetscCall(STGetKSP(st,&ksp));
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 14 PetscCall(KSPSetType(ksp,KSPPREONLY));
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 14 PetscCall(KSPGetPC(ksp,&pc));
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 14 PetscCall(PCSetType(pc,PCLU));
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 14 PetscCall(EPSSetFromOptions(eps));
81
82 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
83 Compute singular values
84 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
85
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 14 PetscCall(SVDCreate(PETSC_COMM_WORLD,&svd));
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 14 PetscCall(SVDSetOperators(svd,A,NULL));
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 14 PetscCall(SVDSetType(svd,SVDCYCLIC));
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 14 PetscCall(SVDCyclicSetEPS(svd,eps));
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 14 PetscCall(SVDCyclicSetExplicitMatrix(svd,PETSC_TRUE));
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 14 PetscCall(SVDSetWhichSingularTriplets(svd,SVD_SMALLEST));
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 14 PetscCall(SVDSetFromOptions(svd));
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 14 PetscCall(PetscObjectTypeCompare((PetscObject)svd,SVDCYCLIC,&flg));
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 14 if (flg) {
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 14 PetscCall(SVDCyclicGetExplicitMatrix(svd,&expmat));
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 14 if (expmat) PetscCall(PetscPrintf(PETSC_COMM_WORLD," Using explicit matrix with cyclic solver\n"));
97 }
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 14 PetscCall(SVDSolve(svd));
99
100 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
101 Display solution and clean up
102 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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 14 PetscCall(SVDErrorView(svd,SVD_ERROR_ABSOLUTE,PETSC_VIEWER_STDOUT_WORLD));
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 14 PetscCall(SVDDestroy(&svd));
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 14 PetscCall(EPSDestroy(&eps));
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 14 PetscCall(MatDestroy(&A));
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 14 PetscCall(SlepcFinalize());
108 return 0;
109 }
110
111 /*TEST
112
113 test:
114 suffix: 1
115 args: -log_exclude svd
116
117 testset:
118 args: -log_exclude svd
119 output_file: output/test7_1.out
120 test:
121 suffix: 2_cuda
122 args: -mat_type aijcusparse
123 requires: cuda
124 test:
125 suffix: 2_hip
126 args: -mat_type aijhipsparse
127 requires: hip
128
129 TEST*/
130