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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 | |||
27 |
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111 | PetscFunctionBeginUser; |
28 |
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111 | PetscCall(SlepcInitialize(&argc,&argv,NULL,help)); |
29 | |||
30 |
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111 | PetscCall(PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL)); |
31 |
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111 | PetscCall(PetscOptionsGetString(NULL,NULL,"-type",epstype,sizeof(epstype),NULL)); |
32 |
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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 | |||
38 |
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111 | PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); |
39 |
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111 | PetscCall(MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,n,n)); |
40 |
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111 | PetscCall(MatSetFromOptions(A)); |
41 | |||
42 |
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111 | PetscCall(MatGetOwnershipRange(A,&Istart,&Iend)); |
43 |
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3441 | for (i=Istart;i<Iend;i++) { |
44 |
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3330 | if (i>0) PetscCall(MatSetValue(A,i,i-1,-1.0,INSERT_VALUES)); |
45 |
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3330 | if (i<n-1) PetscCall(MatSetValue(A,i,i+1,-1.0,INSERT_VALUES)); |
46 |
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3330 | PetscCall(MatSetValue(A,i,i,2.0,INSERT_VALUES)); |
47 | } | ||
48 |
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111 | PetscCall(MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY)); |
49 |
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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 | */ | ||
62 |
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111 | PetscCall(EPSSetOperators(eps,A,NULL)); |
63 |
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111 | PetscCall(EPSSetProblemType(eps,EPS_HEP)); |
64 |
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111 | PetscCall(EPSSetDimensions(eps,4,PETSC_DETERMINE,PETSC_DETERMINE)); |
65 |
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111 | PetscCall(EPSSetTolerances(eps,tol,PETSC_CURRENT)); |
66 | |||
67 | /* | ||
68 | Set solver parameters at runtime | ||
69 | */ | ||
70 |
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111 | PetscCall(PetscStrcmp(epstype,"gd2",&flg)); |
71 |
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111 | if (flg) { |
72 |
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10 | PetscCall(EPSSetType(eps,EPSGD)); |
73 |
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10 | PetscCall(EPSGDSetDoubleExpansion(eps,PETSC_TRUE)); |
74 |
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10 | PetscCall(EPSGDGetDoubleExpansion(eps,&gd2)); /* not used */ |
75 |
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101 | } else PetscCall(EPSSetType(eps,epstype)); |
76 |
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111 | PetscCall(PetscStrcmp(epstype,"jd",&flg)); |
77 |
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111 | if (flg) { |
78 |
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10 | PetscCall(EPSSetWhichEigenpairs(eps,EPS_TARGET_MAGNITUDE)); |
79 |
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10 | PetscCall(EPSSetTarget(eps,4.0)); |
80 | } | ||
81 |
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111 | PetscCall(PetscStrcmp(epstype,"lanczos",&flg)); |
82 |
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111 | if (flg) PetscCall(EPSLanczosSetReorthog(eps,EPS_LANCZOS_REORTHOG_LOCAL)); |
83 |
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111 | PetscCall(PetscObjectTypeCompareAny((PetscObject)eps,&flg,EPSRQCG,EPSLOBPCG,"")); |
84 |
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111 | if (flg) PetscCall(EPSSetWhichEigenpairs(eps,EPS_SMALLEST_REAL)); |
85 | |||
86 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - | ||
87 | Solve the eigensystem | ||
88 | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ | ||
89 | |||
90 |
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111 | PetscCall(EPSSolve(eps)); |
91 |
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111 | PetscCall(EPSGetDimensions(eps,&nev,NULL,NULL)); |
92 |
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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 | |||
98 |
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111 | PetscCall(EPSErrorView(eps,EPS_ERROR_RELATIVE,NULL)); |
99 |
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111 | PetscCall(EPSDestroy(&eps)); |
100 |
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111 | PetscCall(MatDestroy(&A)); |
101 |
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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 |