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Eigen  3.4.0
 
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SparseLU_Utils.h
1// This file is part of Eigen, a lightweight C++ template library
2// for linear algebra.
3//
4// Copyright (C) 2012 Désiré Nuentsa-Wakam <desire.nuentsa_wakam@inria.fr>
5//
6// This Source Code Form is subject to the terms of the Mozilla
7// Public License v. 2.0. If a copy of the MPL was not distributed
8// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9
10
11#ifndef EIGEN_SPARSELU_UTILS_H
12#define EIGEN_SPARSELU_UTILS_H
13
14namespace Eigen {
15namespace internal {
16
20template <typename Scalar, typename StorageIndex>
21void SparseLUImpl<Scalar,StorageIndex>::countnz(const Index n, Index& nnzL, Index& nnzU, GlobalLU_t& glu)
22{
23 nnzL = 0;
24 nnzU = (glu.xusub)(n);
25 Index nsuper = (glu.supno)(n);
26 Index jlen;
27 Index i, j, fsupc;
28 if (n <= 0 ) return;
29 // For each supernode
30 for (i = 0; i <= nsuper; i++)
31 {
32 fsupc = glu.xsup(i);
33 jlen = glu.xlsub(fsupc+1) - glu.xlsub(fsupc);
34
35 for (j = fsupc; j < glu.xsup(i+1); j++)
36 {
37 nnzL += jlen;
38 nnzU += j - fsupc + 1;
39 jlen--;
40 }
41 }
42}
43
51template <typename Scalar, typename StorageIndex>
52void SparseLUImpl<Scalar,StorageIndex>::fixupL(const Index n, const IndexVector& perm_r, GlobalLU_t& glu)
53{
54 Index fsupc, i, j, k, jstart;
55
56 StorageIndex nextl = 0;
57 Index nsuper = (glu.supno)(n);
58
59 // For each supernode
60 for (i = 0; i <= nsuper; i++)
61 {
62 fsupc = glu.xsup(i);
63 jstart = glu.xlsub(fsupc);
64 glu.xlsub(fsupc) = nextl;
65 for (j = jstart; j < glu.xlsub(fsupc + 1); j++)
66 {
67 glu.lsub(nextl) = perm_r(glu.lsub(j)); // Now indexed into P*A
68 nextl++;
69 }
70 for (k = fsupc+1; k < glu.xsup(i+1); k++)
71 glu.xlsub(k) = nextl; // other columns in supernode i
72 }
73
74 glu.xlsub(n) = nextl;
75}
76
77} // end namespace internal
78
79} // end namespace Eigen
80#endif // EIGEN_SPARSELU_UTILS_H
Namespace containing all symbols from the Eigen library.
Definition: Core:141
EIGEN_DEFAULT_DENSE_INDEX_TYPE Index
The Index type as used for the API.
Definition: Meta.h:74