GCC Code Coverage Report


Directory: ./
File: src/pep/tests/test12.c
Date: 2025-10-04 04:19:13
Exec Total Coverage
Lines: 58 58 100.0%
Functions: 1 1 100.0%
Branches: 207 304 68.1%

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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[] = "Illustrates region filtering in PEP (based on spring).\n\n"
12 "The command line options are:\n"
13 " -n <n> ... number of grid subdivisions.\n"
14 " -mu <value> ... mass (default 1).\n"
15 " -tau <value> ... damping constant of the dampers (default 10).\n"
16 " -kappa <value> ... damping constant of the springs (default 5).\n\n";
17
18 #include <slepcpep.h>
19
20 30 int main(int argc,char **argv)
21 {
22 30 Mat M,C,K,A[3]; /* problem matrices */
23 30 PEP pep; /* polynomial eigenproblem solver context */
24 30 RG rg;
25 30 PetscInt n=30,Istart,Iend,i;
26 30 PetscReal mu=1.0,tau=10.0,kappa=5.0;
27
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30 PetscFunctionBeginUser;
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30 PetscCall(SlepcInitialize(&argc,&argv,NULL,help));
30
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30 PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL));
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30 PetscCall(PetscOptionsGetReal(NULL,NULL,"-mu",&mu,NULL));
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30 PetscCall(PetscOptionsGetReal(NULL,NULL,"-tau",&tau,NULL));
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30 PetscCall(PetscOptionsGetReal(NULL,NULL,"-kappa",&kappa,NULL));
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30 PetscCall(PetscPrintf(PETSC_COMM_WORLD,"\nDamped mass-spring system, n=%" PetscInt_FMT " mu=%g tau=%g kappa=%g\n\n",n,(double)mu,(double)tau,(double)kappa));
36
37 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
38 Compute the matrices that define the eigensystem, (k^2*M+k*C+K)x=0
39 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
40
41 /* K is a tridiagonal */
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30 PetscCall(MatCreate(PETSC_COMM_WORLD,&K));
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30 PetscCall(MatSetSizes(K,PETSC_DECIDE,PETSC_DECIDE,n,n));
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30 PetscCall(MatSetFromOptions(K));
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30 PetscCall(MatGetOwnershipRange(K,&Istart,&Iend));
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930 for (i=Istart;i<Iend;i++) {
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900 if (i>0) PetscCall(MatSetValue(K,i,i-1,-kappa,INSERT_VALUES));
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900 PetscCall(MatSetValue(K,i,i,kappa*3.0,INSERT_VALUES));
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900 if (i<n-1) PetscCall(MatSetValue(K,i,i+1,-kappa,INSERT_VALUES));
51 }
52
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30 PetscCall(MatAssemblyBegin(K,MAT_FINAL_ASSEMBLY));
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30 PetscCall(MatAssemblyEnd(K,MAT_FINAL_ASSEMBLY));
55
56 /* C is a tridiagonal */
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30 PetscCall(MatCreate(PETSC_COMM_WORLD,&C));
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30 PetscCall(MatSetSizes(C,PETSC_DECIDE,PETSC_DECIDE,n,n));
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30 PetscCall(MatSetFromOptions(C));
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30 PetscCall(MatGetOwnershipRange(C,&Istart,&Iend));
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930 for (i=Istart;i<Iend;i++) {
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900 if (i>0) PetscCall(MatSetValue(C,i,i-1,-tau,INSERT_VALUES));
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900 PetscCall(MatSetValue(C,i,i,tau*3.0,INSERT_VALUES));
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900 if (i<n-1) PetscCall(MatSetValue(C,i,i+1,-tau,INSERT_VALUES));
66 }
67
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30 PetscCall(MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY));
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30 PetscCall(MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY));
70
71 /* M is a diagonal matrix */
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30 PetscCall(MatCreate(PETSC_COMM_WORLD,&M));
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30 PetscCall(MatSetSizes(M,PETSC_DECIDE,PETSC_DECIDE,n,n));
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30 PetscCall(MatSetFromOptions(M));
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30 PetscCall(MatGetOwnershipRange(M,&Istart,&Iend));
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930 for (i=Istart;i<Iend;i++) PetscCall(MatSetValue(M,i,i,mu,INSERT_VALUES));
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30 PetscCall(MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY));
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30 PetscCall(MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY));
79
80 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
81 Create a region for filtering
82 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
83
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30 PetscCall(RGCreate(PETSC_COMM_WORLD,&rg));
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30 PetscCall(RGSetType(rg,RGINTERVAL));
86 #if defined(PETSC_USE_COMPLEX)
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15 PetscCall(RGIntervalSetEndpoints(rg,-47.0,-35.0,-0.001,0.001));
88 #else
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15 PetscCall(RGIntervalSetEndpoints(rg,-47.0,-35.0,-0.0,0.0));
90 #endif
91
92 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
93 Create the eigensolver and solve the problem
94 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
95
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30 PetscCall(PEPCreate(PETSC_COMM_WORLD,&pep));
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30 PetscCall(PEPSetRG(pep,rg));
98 30 A[0] = K; A[1] = C; A[2] = M;
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30 PetscCall(PEPSetOperators(pep,3,A));
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30 PetscCall(PEPSetTolerances(pep,PETSC_SMALL,PETSC_CURRENT));
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30 PetscCall(PEPSetFromOptions(pep));
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30 PetscCall(PEPSolve(pep));
103
104 /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
105 Display solution and clean up
106 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
107
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30 PetscCall(PEPErrorView(pep,PEP_ERROR_BACKWARD,NULL));
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30 PetscCall(PEPDestroy(&pep));
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30 PetscCall(MatDestroy(&M));
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30 PetscCall(MatDestroy(&C));
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30 PetscCall(MatDestroy(&K));
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30 PetscCall(RGDestroy(&rg));
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30 PetscCall(SlepcFinalize());
115 return 0;
116 }
117
118 /*TEST
119
120 test:
121 args: -pep_nev 8 -pep_type {{toar linear qarnoldi}}
122 suffix: 1
123 requires: !single
124 output_file: output/test12_1.out
125
126 TEST*/
127