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SparseLU_copy_to_ucol.h
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Sat, Feb 22, 15:39

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

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