Actual source code: test15.c
slepc-3.18.3 2023-03-24
1: /*
2: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3: SLEPc - Scalable Library for Eigenvalue Problem Computations
4: Copyright (c) 2002-, Universitat Politecnica de Valencia, Spain
6: This file is part of SLEPc.
7: SLEPc is distributed under a 2-clause BSD license (see LICENSE).
8: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9: */
11: static char help[] = "Tests user interface for TRLANCZOS with GSVD.\n\n"
12: "The command line options are:\n"
13: " -m <m>, where <m> = number of rows of A.\n"
14: " -n <n>, where <n> = number of columns of A.\n"
15: " -p <p>, where <p> = number of rows of B.\n"
16: " -s <s>, where <s> = scale parameter.\n\n";
18: #include <slepcsvd.h>
20: int main(int argc,char **argv)
21: {
22: Mat A,B;
23: SVD svd;
24: KSP ksp;
25: PC pc;
26: PetscInt m=15,n=20,p=21,i,j,d,Istart,Iend;
27: PetscReal keep,scale=1.0;
28: PetscBool flg,lock,oneside;
29: SVDTRLanczosGBidiag bidiag;
32: SlepcInitialize(&argc,&argv,(char*)0,help);
33: PetscOptionsGetInt(NULL,NULL,"-m",&m,NULL);
34: PetscOptionsGetInt(NULL,NULL,"-n",&n,NULL);
35: PetscOptionsGetInt(NULL,NULL,"-p",&p,NULL);
36: PetscOptionsGetReal(NULL,NULL,"-s",&scale,NULL);
37: PetscPrintf(PETSC_COMM_WORLD,"\nGeneralized singular value decomposition, (%" PetscInt_FMT "+%" PetscInt_FMT ")x%" PetscInt_FMT "\n\n",m,p,n);
39: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
40: Generate the matrices
41: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
43: MatCreate(PETSC_COMM_WORLD,&A);
44: MatSetSizes(A,PETSC_DECIDE,PETSC_DECIDE,m,n);
45: MatSetFromOptions(A);
46: MatSetUp(A);
48: MatGetOwnershipRange(A,&Istart,&Iend);
49: for (i=Istart;i<Iend;i++) {
50: if (i>0 && i-1<n) MatSetValue(A,i,i-1,-1.0,INSERT_VALUES);
51: if (i+1<n) MatSetValue(A,i,i+1,-1.0,INSERT_VALUES);
52: if (i<n) MatSetValue(A,i,i,2.0,INSERT_VALUES);
53: if (i>n) MatSetValue(A,i,n-1,1.0,INSERT_VALUES);
54: }
55: MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
56: MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
58: MatCreate(PETSC_COMM_WORLD,&B);
59: MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,p,n);
60: MatSetFromOptions(B);
61: MatSetUp(B);
63: MatGetOwnershipRange(B,&Istart,&Iend);
64: d = PetscMax(0,n-p);
65: for (i=Istart;i<Iend;i++) {
66: for (j=0;j<=PetscMin(i,n-1);j++) MatSetValue(B,i,j+d,1.0,INSERT_VALUES);
67: }
68: MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);
69: MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);
71: /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
72: Create the singular value solver, set options and solve
73: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
75: SVDCreate(PETSC_COMM_WORLD,&svd);
76: SVDSetOperators(svd,A,B);
77: SVDSetProblemType(svd,SVD_GENERALIZED);
78: SVDSetDimensions(svd,4,PETSC_DEFAULT,PETSC_DEFAULT);
79: SVDSetConvergenceTest(svd,SVD_CONV_NORM);
81: SVDSetType(svd,SVDTRLANCZOS);
82: SVDTRLanczosSetGBidiag(svd,SVD_TRLANCZOS_GBIDIAG_UPPER);
83: SVDTRLanczosSetScale(svd,scale);
85: /* create a standalone KSP with appropriate settings */
86: KSPCreate(PETSC_COMM_WORLD,&ksp);
87: KSPSetType(ksp,KSPLSQR);
88: KSPGetPC(ksp,&pc);
89: PCSetType(pc,PCNONE);
90: KSPSetTolerances(ksp,PETSC_SMALL,PETSC_DEFAULT,PETSC_DEFAULT,PETSC_DEFAULT);
91: KSPSetFromOptions(ksp);
92: SVDTRLanczosSetKSP(svd,ksp);
93: SVDTRLanczosSetRestart(svd,0.4);
94: SVDTRLanczosSetLocking(svd,PETSC_TRUE);
96: SVDSetFromOptions(svd);
98: PetscObjectTypeCompare((PetscObject)svd,SVDTRLANCZOS,&flg);
99: if (flg) {
100: SVDTRLanczosGetGBidiag(svd,&bidiag);
101: PetscPrintf(PETSC_COMM_WORLD,"TRLANCZOS: using %s bidiagonalization\n",SVDTRLanczosGBidiags[bidiag]);
102: SVDTRLanczosGetRestart(svd,&keep);
103: SVDTRLanczosGetLocking(svd,&lock);
104: PetscPrintf(PETSC_COMM_WORLD,"TRLANCZOS: restarting parameter %.2f %s\n",(double)keep,lock?"(locking)":"");
105: SVDTRLanczosGetScale(svd,&scale);
106: PetscPrintf(PETSC_COMM_WORLD,"TRLANCZOS: scale parameter %g\n",(double)scale);
107: SVDTRLanczosGetOneSide(svd,&oneside);
108: if (oneside) PetscPrintf(PETSC_COMM_WORLD,"TRLANCZOS: using one-sided orthogonalization\n");
109: }
111: SVDSolve(svd);
112: SVDErrorView(svd,SVD_ERROR_NORM,NULL);
114: /* Free work space */
115: SVDDestroy(&svd);
116: KSPDestroy(&ksp);
117: MatDestroy(&A);
118: MatDestroy(&B);
119: SlepcFinalize();
120: return 0;
121: }
123: /*TEST
125: test:
126: suffix: 1
127: args: -svd_trlanczos_gbidiag {{single upper lower}}
128: filter: grep -v "TRLANCZOS: using"
129: requires: !single
131: test:
132: suffix: 2
133: args: -m 6 -n 12 -p 12 -svd_trlanczos_restart .7
134: requires: !single
136: test:
137: suffix: 3
138: args: -s 8 -svd_trlanczos_gbidiag lower
139: requires: !single
141: test:
142: suffix: 4
143: args: -s -5 -svd_trlanczos_gbidiag lower
144: requires: !single
146: TEST*/