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annotate scripts/sparse/spconvert.m @ 8596:8833c0b18eb2

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enable default settings queries in optim funcs
author Jaroslav Hajek <highegg@gmail.com>
date Tue, 27 Jan 2009 08:15:08 +0100
parents a1dbe9d80eee
children 1bf0ce0930be
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2004, 2005, 2007 David Bateman & Andy Adler
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{x} =} spconvert (@var{m})
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21 ## This function converts for a simple sparse matrix format easily
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22 ## produced by other programs into Octave's internal sparse format. The
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23 ## input @var{x} is either a 3 or 4 column real matrix, containing
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24 ## the row, column, real and imaginary parts of the elements of the
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25 ## sparse matrix. An element with a zero real and imaginary part can
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26 ## be used to force a particular matrix size.
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27 ## @end deftypefn
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28
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29 function s = spconvert (m)
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30
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31 if (issparse (m))
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32 s = m;
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33 else
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34 sz = size (m);
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35 if (nargin != 1 || ! ismatrix (m) || ! isreal (m)
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36 || length (sz) != 2 || (sz(2) != 3 && sz(2) != 4))
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37 error ("spconvert: argument must be sparse or real matrix with 3 or 4 columns");
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38 elseif (sz(2) == 3)
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39 s = sparse (m(:,1), m(:,2), m(:,3));
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40 else
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41 s = sparse (m(:,1), m(:,2), m(:,3) + 1i*m(:,4));
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42 endif
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43 endif
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44
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45 endfunction