/usr/include/octave-3.8.1/octave/sparse-base-lu.cc is in liboctave-dev 3.8.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Copyright (C) 2004-2013 David Bateman
Copyright (C) 1998-2004 Andy Adler
This file is part of Octave.
Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "sparse-base-lu.h"
template <class lu_type, class lu_elt_type, class p_type, class p_elt_type>
lu_type
sparse_base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: Y (void) const
{
octave_idx_type nr = Lfact.rows ();
octave_idx_type nz = Lfact.cols ();
octave_idx_type nc = Ufact.cols ();
lu_type Yout (nr, nc, Lfact.nnz () + Ufact.nnz () - (nr<nz?nr:nz));
octave_idx_type ii = 0;
Yout.xcidx (0) = 0;
for (octave_idx_type j = 0; j < nc; j++)
{
for (octave_idx_type i = Ufact.cidx (j); i < Ufact.cidx (j + 1); i++)
{
Yout.xridx (ii) = Ufact.ridx (i);
Yout.xdata (ii++) = Ufact.data (i);
}
if (j < nz)
{
// Note the +1 skips the 1.0 on the diagonal
for (octave_idx_type i = Lfact.cidx (j) + 1;
i < Lfact.cidx (j +1); i++)
{
Yout.xridx (ii) = Lfact.ridx (i);
Yout.xdata (ii++) = Lfact.data (i);
}
}
Yout.xcidx (j + 1) = ii;
}
return Yout;
}
template <class lu_type, class lu_elt_type, class p_type, class p_elt_type>
p_type
sparse_base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: Pr (void) const
{
octave_idx_type nr = Lfact.rows ();
p_type Pout (nr, nr, nr);
for (octave_idx_type i = 0; i < nr; i++)
{
Pout.cidx (i) = i;
Pout.ridx (P (i)) = i;
Pout.data (i) = 1;
}
Pout.cidx (nr) = nr;
return Pout;
}
template <class lu_type, class lu_elt_type, class p_type, class p_elt_type>
ColumnVector
sparse_base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: Pr_vec (void) const
{
octave_idx_type nr = Lfact.rows ();
ColumnVector Pout (nr);
for (octave_idx_type i = 0; i < nr; i++)
Pout.xelem (i) = static_cast<double> (P(i) + 1);
return Pout;
}
template <class lu_type, class lu_elt_type, class p_type, class p_elt_type>
PermMatrix
sparse_base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: Pr_mat (void) const
{
return PermMatrix (P, false);
}
template <class lu_type, class lu_elt_type, class p_type, class p_elt_type>
p_type
sparse_base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: Pc (void) const
{
octave_idx_type nc = Ufact.cols ();
p_type Pout (nc, nc, nc);
for (octave_idx_type i = 0; i < nc; i++)
{
Pout.cidx (i) = i;
Pout.ridx (i) = Q (i);
Pout.data (i) = 1;
}
Pout.cidx (nc) = nc;
return Pout;
}
template <class lu_type, class lu_elt_type, class p_type, class p_elt_type>
ColumnVector
sparse_base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: Pc_vec (void) const
{
octave_idx_type nc = Ufact.cols ();
ColumnVector Pout (nc);
for (octave_idx_type i = 0; i < nc; i++)
Pout.xelem (i) = static_cast<double> (Q(i) + 1);
return Pout;
}
template <class lu_type, class lu_elt_type, class p_type, class p_elt_type>
PermMatrix
sparse_base_lu <lu_type, lu_elt_type, p_type, p_elt_type> :: Pc_mat (void) const
{
return PermMatrix (Q, true);
}
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