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annotate scripts/sparse/colperm.m @ 20815:a260a6acb70f

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fix test failures introduced by a22d8a2eb0e5 * scripts/ode/private/integrate_adaptive.m: fix stepping backwards, fix invocation of OutputFcn, fix text of some error messages * scripts/ode/private/integrate_const.m: remove use of option OutputSave * scripts/ode/private/integrate_n_steps.m: remove use of option OutputSave
author Carlo de Falco <carlo.defalco@polimi.it>
date Sun, 11 Oct 2015 23:09:01 +0200
parents df437a52bcaf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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19898
4197fc428c7d maint: Update copyright notices for 2015.
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 2004-2015 David Bateman and 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{p} =} colperm (@var{s})
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21 ## Return the column permutations such that the columns of
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22 ## @code{@var{s} (:, @var{p})} are ordered in terms of increasing number of
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23 ## nonzero elements.
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24 ##
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25 ## If @var{s} is symmetric, then @var{p} is chosen such that
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26 ## @code{@var{s} (@var{p}, @var{p})} orders the rows and columns with
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27 ## increasing number of nonzeros elements.
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28 ## @end deftypefn
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29
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30 function p = colperm (s)
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32 if (nargin != 1)
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33 print_usage ();
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34 endif
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35
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f5005d9510f4 Remove dispatched sparse functions and treat in the generic versions of the functions
David Bateman <dbateman@free.fr>
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36 [i, j] = find (s);
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37 idx = find (diff ([j; Inf]) != 0);
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38 [dummy, p] = sort (idx - [0; idx(1:(end-1))]);
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39 endfunction
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