| 1 | // This file is part of Eigen, a lightweight C++ template library
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| 2 | // for linear algebra.
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| 3 | //
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| 4 | // Copyright (C) 2012 Désiré Nuentsa-Wakam <desire.nuentsa_wakam@inria.fr>
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| 5 | //
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| 6 | // This Source Code Form is subject to the terms of the Mozilla
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| 7 | // Public License v. 2.0. If a copy of the MPL was not distributed
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| 8 | // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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| 9 |
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| 10 |
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| 11 | #ifndef EIGEN_SPARSELU_UTILS_H
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| 12 | #define EIGEN_SPARSELU_UTILS_H
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| 13 |
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| 14 | namespace Eigen {
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| 15 | namespace internal {
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| 16 |
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| 17 | /**
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| 18 | * \brief Count Nonzero elements in the factors
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| 19 | */
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| 20 | template <typename Scalar, typename Index>
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| 21 | void SparseLUImpl<Scalar,Index>::countnz(const Index n, Index& nnzL, Index& nnzU, GlobalLU_t& glu)
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| 22 | {
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| 23 | nnzL = 0;
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| 24 | nnzU = (glu.xusub)(n);
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| 25 | Index nsuper = (glu.supno)(n);
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| 26 | Index jlen;
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| 27 | Index i, j, fsupc;
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| 28 | if (n <= 0 ) return;
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| 29 | // For each supernode
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| 30 | for (i = 0; i <= nsuper; i++)
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| 31 | {
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| 32 | fsupc = glu.xsup(i);
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| 33 | jlen = glu.xlsub(fsupc+1) - glu.xlsub(fsupc);
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| 34 |
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| 35 | for (j = fsupc; j < glu.xsup(i+1); j++)
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| 36 | {
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| 37 | nnzL += jlen;
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| 38 | nnzU += j - fsupc + 1;
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| 39 | jlen--;
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| 40 | }
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| 41 | }
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| 42 | }
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| 43 |
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| 44 | /**
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| 45 | * \brief Fix up the data storage lsub for L-subscripts.
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| 46 | *
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| 47 | * It removes the subscripts sets for structural pruning,
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| 48 | * and applies permutation to the remaining subscripts
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| 49 | *
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| 50 | */
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| 51 | template <typename Scalar, typename Index>
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| 52 | void SparseLUImpl<Scalar,Index>::fixupL(const Index n, const IndexVector& perm_r, GlobalLU_t& glu)
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| 53 | {
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| 54 | Index fsupc, i, j, k, jstart;
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| 55 |
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| 56 | Index nextl = 0;
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| 57 | Index nsuper = (glu.supno)(n);
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| 58 |
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| 59 | // For each supernode
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| 60 | for (i = 0; i <= nsuper; i++)
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| 61 | {
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| 62 | fsupc = glu.xsup(i);
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| 63 | jstart = glu.xlsub(fsupc);
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| 64 | glu.xlsub(fsupc) = nextl;
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| 65 | for (j = jstart; j < glu.xlsub(fsupc + 1); j++)
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| 66 | {
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| 67 | glu.lsub(nextl) = perm_r(glu.lsub(j)); // Now indexed into P*A
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| 68 | nextl++;
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| 69 | }
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| 70 | for (k = fsupc+1; k < glu.xsup(i+1); k++)
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| 71 | glu.xlsub(k) = nextl; // other columns in supernode i
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| 72 | }
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| 73 |
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| 74 | glu.xlsub(n) = nextl;
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| 75 | }
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| 76 |
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| 77 | } // end namespace internal
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| 78 |
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| 79 | } // end namespace Eigen
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| 80 | #endif // EIGEN_SPARSELU_UTILS_H
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