SparseLU_Utils.h
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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 
14 namespace Eigen {
15 namespace internal {
16 
20 template <typename Scalar, typename StorageIndex>
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 
51 template <typename Scalar, typename StorageIndex>
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
int n
Namespace containing all symbols from the Eigen library.
Definition: jet.h:637
void fixupL(const Index n, const IndexVector &perm_r, GlobalLU_t &glu)
Fix up the data storage lsub for L-subscripts.
void countnz(const Index n, Index &nnzL, Index &nnzU, GlobalLU_t &glu)
Count Nonzero elements in the factors.
EIGEN_DEFAULT_DENSE_INDEX_TYPE Index
The Index type as used for the API.
Definition: Meta.h:74
The matrix class, also used for vectors and row-vectors.
std::ptrdiff_t j


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autogenerated on Tue Jul 4 2023 02:35:59