107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
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// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2012 Désiré Nuentsa-Wakam <desire.nuentsa_wakam@inria.fr>
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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/*
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* NOTE: This file is the modified version of [s,d,c,z]copy_to_ucol.c file in SuperLU
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* -- SuperLU routine (version 2.0) --
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* Univ. of California Berkeley, Xerox Palo Alto Research Center,
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* and Lawrence Berkeley National Lab.
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* November 15, 1997
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*
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* Copyright (c) 1994 by Xerox Corporation. All rights reserved.
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*
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* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
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* EXPRESSED OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
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*
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* Permission is hereby granted to use or copy this program for any
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* purpose, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is
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* granted, provided the above notices are retained, and a notice that
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* the code was modified is included with the above copyright notice.
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*/
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#ifndef SPARSELU_COPY_TO_UCOL_H
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#define SPARSELU_COPY_TO_UCOL_H
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namespace Eigen {
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namespace internal {
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/**
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* \brief Performs numeric block updates (sup-col) in topological order
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*
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* \param jcol current column to update
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* \param nseg Number of segments in the U part
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* \param segrep segment representative ...
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* \param repfnz First nonzero column in each row ...
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* \param perm_r Row permutation
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* \param dense Store the full representation of the column
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* \param glu Global LU data.
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* \return 0 - successful return
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* > 0 - number of bytes allocated when run out of space
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*
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*/
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template <typename Scalar, typename Index>
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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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{
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Index ksub, krep, ksupno;
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Index jsupno = glu.supno(jcol);
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// For each nonzero supernode segment of U[*,j] in topological order
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Index k = nseg - 1, i;
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Index nextu = glu.xusub(jcol);
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Index kfnz, isub, segsize;
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Index new_next,irow;
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Index fsupc, mem;
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for (ksub = 0; ksub < nseg; ksub++)
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{
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krep = segrep(k); k--;
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ksupno = glu.supno(krep);
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if (jsupno != ksupno ) // should go into ucol();
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{
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kfnz = repfnz(krep);
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if (kfnz != emptyIdxLU)
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{ // Nonzero U-segment
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fsupc = glu.xsup(ksupno);
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isub = glu.xlsub(fsupc) + kfnz - fsupc;
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segsize = krep - kfnz + 1;
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new_next = nextu + segsize;
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while (new_next > glu.nzumax)
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{
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mem = memXpand<ScalarVector>(glu.ucol, glu.nzumax, nextu, UCOL, glu.num_expansions);
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if (mem) return mem;
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mem = memXpand<IndexVector>(glu.usub, glu.nzumax, nextu, USUB, glu.num_expansions);
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if (mem) return mem;
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}
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for (i = 0; i < segsize; i++)
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{
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irow = glu.lsub(isub);
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glu.usub(nextu) = perm_r(irow); // Unlike the L part, the U part is stored in its final order
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glu.ucol(nextu) = dense(irow);
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dense(irow) = Scalar(0.0);
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nextu++;
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isub++;
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}
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} // end nonzero U-segment
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} // end if jsupno
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} // end for each segment
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glu.xusub(jcol + 1) = nextu; // close U(*,jcol)
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return 0;
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}
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} // namespace internal
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} // end namespace Eigen
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#endif // SPARSELU_COPY_TO_UCOL_H
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