GCC Code Coverage Report

Directory: ./
File: src/svd/tests/test9.c
Date: 2025-10-04 04:19:13
Exec Total Coverage
Lines: 45 45 100.0%
Functions: 1 1 100.0%
Branches: 144 214 67.3%
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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[] = "Tests multiple calls to SVDSolve with different matrix size.\n\n"
12 "The command line options are:\n"
13 " -n <n>, where <n> = matrix dimension.\n\n";
14
15 #include <slepcsvd.h>
16
17 /*
18 This example computes the singular values of an nxn Grcar matrix,
19 which is a nonsymmetric Toeplitz matrix:
20
21 | 1 1 1 1 |
22 | -1 1 1 1 1 |
23 | -1 1 1 1 1 |
24 | . . . . . |
25 A = | . . . . . |
26 | -1 1 1 1 1 |
27 | -1 1 1 1 |
28 | -1 1 1 |
29 | -1 1 |
30
31 */
32
33 60 int main(int argc,char **argv)
34 {
35 60 Mat A,B;
36 60 SVD svd;
37 60 PetscInt N=30,Istart,Iend,i,col[5];
38 60 PetscScalar value[] = { -1, 1, 1, 1, 1 };
39
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 60 PetscFunctionBeginUser;
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 60 PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
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 60 PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&N,NULL));
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 60 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nSingular values of a Grcar matrix, n=%" PetscInt_FMT "\n\n",N));
44
45 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
46 Generate the matrix of size N
47 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
48
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 60 PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
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 60 PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,N,N));
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 60 PetscCall(MatSetFromOptions(A));
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 60 PetscCall(MatGetOwnershipRange(A,&Istart,&Iend));
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 1860 for (i=Istart;i<Iend;i++) {
54 1800 col[0]=i-1; col[1]=i; col[2]=i+1; col[3]=i+2; col[4]=i+3;
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 1800 if (i==0) PetscCall(MatSetValues(A,1,&i,4,col+1,value+1,INSERT_VALUES));
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 1800 else PetscCall(MatSetValues(A,1,&i,PetscMin(5,N-i+1),col,value,INSERT_VALUES));
57 }
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 60 PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
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 60 PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));
60
61 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
62 Create the singular value solver, set options and solve
63 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
64
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 60 PetscCall(SVDCreate(PETSC_COMM_WORLD,&svd));
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 60 PetscCall(SVDSetOperators(svd,A,NULL));
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 60 PetscCall(SVDSetTolerances(svd,1e-6,1000));
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 60 PetscCall(SVDSetFromOptions(svd));
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 60 PetscCall(SVDSolve(svd));
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 60 PetscCall(SVDErrorView(svd,SVD_ERROR_RELATIVE,NULL));
71
72 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
73 Generate the matrix of size 2*N
74 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
75
76 60 N *= 2;
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 60 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nSingular values of a Grcar matrix, n=%" PetscInt_FMT "\n\n",N));
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 60 PetscCall(MatCreate(PETSC_COMM_WORLD,&B));
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 60 PetscCall(MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,N,N));
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 60 PetscCall(MatSetFromOptions(B));
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 60 PetscCall(MatGetOwnershipRange(B,&Istart,&Iend));
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 3660 for (i=Istart;i<Iend;i++) {
84 3600 col[0]=i-1; col[1]=i; col[2]=i+1; col[3]=i+2; col[4]=i+3;
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 3600 if (i==0) PetscCall(MatSetValues(B,1,&i,4,col+1,value+1,INSERT_VALUES));
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 3600 else PetscCall(MatSetValues(B,1,&i,PetscMin(5,N-i+1),col,value,INSERT_VALUES));
87 }
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 60 PetscCall(MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY));
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 60 PetscCall(MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY));
90
91 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
92 Solve again, calling SVDReset() since matrix size has changed
93 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
94
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 60 PetscCall(SVDReset(svd)); /* if this is omitted, it will be called in SVDSetOperators() */
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 60 PetscCall(SVDSetOperators(svd,B,NULL));
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 60 PetscCall(SVDSolve(svd));
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 60 PetscCall(SVDErrorView(svd,SVD_ERROR_RELATIVE,NULL));
99
100 /* Free work space */
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 60 PetscCall(SVDDestroy(&svd));
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 60 PetscCall(MatDestroy(&A));
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 60 PetscCall(MatDestroy(&B));
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 60 PetscCall(SlepcFinalize());
105 return 0;
106 }
107
108 /*TEST
109
110 test:
111 suffix: 1
112 args: -svd_type {{lanczos trlanczos cross cyclic lapack randomized}} -svd_nsv 3
113 requires: double
114
115 TEST*/
116