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 | * NOTE: This file is the modified version of [s,d,c,z]copy_to_ucol.c file in SuperLU
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12 |
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13 | * -- SuperLU routine (version 2.0) --
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14 | * Univ. of California Berkeley, Xerox Palo Alto Research Center,
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15 | * and Lawrence Berkeley National Lab.
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16 | * November 15, 1997
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17 | *
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18 | * Copyright (c) 1994 by Xerox Corporation. All rights reserved.
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19 | *
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20 | * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
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21 | * EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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22 | *
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23 | * Permission is hereby granted to use or copy this program for any
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24 | * purpose, provided the above notices are retained on all copies.
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25 | * Permission to modify the code and to distribute modified code is
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26 | * granted, provided the above notices are retained, and a notice that
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27 | * the code was modified is included with the above copyright notice.
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28 | */
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29 | #ifndef SPARSELU_COPY_TO_UCOL_H
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30 | #define SPARSELU_COPY_TO_UCOL_H
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31 |
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32 | namespace Eigen {
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33 | namespace internal {
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34 |
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35 | /**
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36 | * \brief Performs numeric block updates (sup-col) in topological order
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37 | *
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38 | * \param jcol current column to update
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39 | * \param nseg Number of segments in the U part
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40 | * \param segrep segment representative ...
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41 | * \param repfnz First nonzero column in each row ...
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42 | * \param perm_r Row permutation
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43 | * \param dense Store the full representation of the column
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44 | * \param glu Global LU data.
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45 | * \return 0 - successful return
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46 | * > 0 - number of bytes allocated when run out of space
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47 | *
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48 | */
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49 | template <typename Scalar, typename Index>
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50 | Index SparseLUImpl<Scalar,Index>::copy_to_ucol(const Index jcol, const Index nseg, IndexVector& segrep, BlockIndexVector repfnz ,IndexVector& perm_r, BlockScalarVector dense, GlobalLU_t& glu)
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51 | {
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52 | Index ksub, krep, ksupno;
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53 |
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54 | Index jsupno = glu.supno(jcol);
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55 |
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56 | // For each nonzero supernode segment of U[*,j] in topological order
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57 | Index k = nseg - 1, i;
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58 | Index nextu = glu.xusub(jcol);
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59 | Index kfnz, isub, segsize;
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60 | Index new_next,irow;
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61 | Index fsupc, mem;
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62 | for (ksub = 0; ksub < nseg; ksub++)
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63 | {
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64 | krep = segrep(k); k--;
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65 | ksupno = glu.supno(krep);
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66 | if (jsupno != ksupno ) // should go into ucol();
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67 | {
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68 | kfnz = repfnz(krep);
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69 | if (kfnz != emptyIdxLU)
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70 | { // Nonzero U-segment
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71 | fsupc = glu.xsup(ksupno);
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72 | isub = glu.xlsub(fsupc) + kfnz - fsupc;
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73 | segsize = krep - kfnz + 1;
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74 | new_next = nextu + segsize;
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75 | while (new_next > glu.nzumax)
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76 | {
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77 | mem = memXpand<ScalarVector>(glu.ucol, glu.nzumax, nextu, UCOL, glu.num_expansions);
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78 | if (mem) return mem;
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79 | mem = memXpand<IndexVector>(glu.usub, glu.nzumax, nextu, USUB, glu.num_expansions);
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80 | if (mem) return mem;
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81 |
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82 | }
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83 |
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84 | for (i = 0; i < segsize; i++)
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85 | {
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86 | irow = glu.lsub(isub);
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87 | glu.usub(nextu) = perm_r(irow); // Unlike the L part, the U part is stored in its final order
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88 | glu.ucol(nextu) = dense(irow);
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89 | dense(irow) = Scalar(0.0);
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90 | nextu++;
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91 | isub++;
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92 | }
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93 |
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94 | } // end nonzero U-segment
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95 |
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96 | } // end if jsupno
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97 |
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98 | } // end for each segment
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99 | glu.xusub(jcol + 1) = nextu; // close U(*,jcol)
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100 | return 0;
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101 | }
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102 |
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103 | } // namespace internal
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104 | } // end namespace Eigen
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105 |
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106 | #endif // SPARSELU_COPY_TO_UCOL_H
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