GCC Code Coverage Report


Directory: ./
File: src/eps/tests/test4.c
Date: 2025-10-04 04:19:13
Exec Total Coverage
Lines: 48 48 100.0%
Functions: 1 1 100.0%
Branches: 159 238 66.8%

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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[] = "Test the solution of a HEP without calling EPSSetFromOptions (based on ex1.c).\n\n"
12 "The command line options are:\n"
13 " -n <n>, where <n> = number of grid subdivisions = matrix dimension.\n"
14 " -type <eps_type> = eps type to test.\n\n";
15
16 #include <slepceps.h>
17
18 111 int main(int argc,char **argv)
19 {
20 111 Mat A; /* problem matrix */
21 111 EPS eps; /* eigenproblem solver context */
22 111 PetscReal tol=1000*PETSC_MACHINE_EPSILON;
23 111 PetscInt n=30,i,Istart,Iend,nev;
24 111 PetscBool flg,gd2;
25 111 char epstype[30] = "krylovschur";
26
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111 PetscFunctionBeginUser;
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111 PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
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111 PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
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111 PetscCall(PetscOptionsGetString(NULL,NULL,"-type",epstype,sizeof(epstype),NULL));
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111 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\n1-D Laplacian Eigenproblem, n=%" PetscInt_FMT "\n\n",n));
33
34 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
35 Compute the operator matrix that defines the eigensystem, Ax=kx
36 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
37
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111 PetscCall(MatCreate(PETSC_COMM_WORLD,&A));
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111 PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n));
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111 PetscCall(MatSetFromOptions(A));
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111 PetscCall(MatGetOwnershipRange(A,&Istart,&Iend));
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3441 for (i=Istart;i<Iend;i++) {
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3330 if (i>0) PetscCall(MatSetValue(A,i,i-1,-1.0,INSERT_VALUES));
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3330 if (i<n-1) PetscCall(MatSetValue(A,i,i+1,-1.0,INSERT_VALUES));
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3330 PetscCall(MatSetValue(A,i,i,2.0,INSERT_VALUES));
47 }
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111 PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY));
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111 PetscCall(MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY));
50
51 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
52 Create the eigensolver and set various options
53 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
54 /*
55 Create eigensolver context
56 */
57
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111 PetscCall(EPSCreate(PETSC_COMM_WORLD,&eps));
58
59 /*
60 Set operators. In this case, it is a standard eigenvalue problem
61 */
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111 PetscCall(EPSSetOperators(eps,A,NULL));
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111 PetscCall(EPSSetProblemType(eps,EPS_HEP));
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111 PetscCall(EPSSetDimensions(eps,4,PETSC_DETERMINE,PETSC_DETERMINE));
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111 PetscCall(EPSSetTolerances(eps,tol,PETSC_CURRENT));
66
67 /*
68 Set solver parameters at runtime
69 */
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111 PetscCall(PetscStrcmp(epstype,"gd2",&flg));
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111 if (flg) {
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10 PetscCall(EPSSetType(eps,EPSGD));
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10 PetscCall(EPSGDSetDoubleExpansion(eps,PETSC_TRUE));
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10 PetscCall(EPSGDGetDoubleExpansion(eps,&gd2)); /* not used */
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101 } else PetscCall(EPSSetType(eps,epstype));
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111 PetscCall(PetscStrcmp(epstype,"jd",&flg));
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111 if (flg) {
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10 PetscCall(EPSSetWhichEigenpairs(eps,EPS_TARGET_MAGNITUDE));
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10 PetscCall(EPSSetTarget(eps,4.0));
80 }
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111 PetscCall(PetscStrcmp(epstype,"lanczos",&flg));
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111 if (flg) PetscCall(EPSLanczosSetReorthog(eps,EPS_LANCZOS_REORTHOG_LOCAL));
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111 PetscCall(PetscObjectTypeCompareAny((PetscObject)eps,&flg,EPSRQCG,EPSLOBPCG,""));
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111 if (flg) PetscCall(EPSSetWhichEigenpairs(eps,EPS_SMALLEST_REAL));
85
86 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
87 Solve the eigensystem
88 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
89
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111 PetscCall(EPSSolve(eps));
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111 PetscCall(EPSGetDimensions(eps,&nev,NULL,NULL));
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111 PetscCall(PetscPrintf(PETSC_COMM_WORLD," Number of requested eigenvalues: %" PetscInt_FMT "\n",nev));
93
94 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
95 Display solution and clean up
96 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
97
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111 PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL));
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111 PetscCall(EPSDestroy(&eps));
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111 PetscCall(MatDestroy(&A));
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111 PetscCall(SlepcFinalize());
102 return 0;
103 }
104
105 /*TEST
106
107 testset:
108 filter: sed -e "s/3.95905/3.95906/"
109 output_file: output/test4_1.out
110 test:
111 suffix: 1
112 args: -type {{krylovschur subspace arnoldi lanczos gd jd gd2 lapack}}
113 test:
114 suffix: 1_arpack
115 args: -type arpack
116 requires: arpack
117 test:
118 suffix: 1_primme
119 args: -type primme
120 requires: primme
121
122 test:
123 suffix: 2
124 args: -type {{rqcg lobpcg}}
125
126 TEST*/
127