Mercurial > octave
view scripts/sparse/colperm.m @ 31221:f5755dbacd8d
maint: merge stable to default
author | Pantxo Diribarne <pantxo.diribarne@gmail.com> |
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date | Wed, 31 Aug 2022 22:04:02 +0200 |
parents | 796f54d4ddbf |
children | 597f3ee61a48 |
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######################################################################## ## ## Copyright (C) 2004-2022 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## 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 ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{p} =} colperm (@var{s}) ## Return the column permutations such that the columns of ## @code{@var{s}(:, @var{p})} are ordered in terms of increasing number of ## nonzero elements. ## ## If @var{s} is symmetric, then @var{p} is chosen such that ## @code{@var{s}(@var{p}, @var{p})} orders the rows and columns with ## increasing number of nonzero elements. ## @end deftypefn function p = colperm (s) if (nargin < 1) print_usage (); endif [~, p] = sort (sum (s != 0, 1)); endfunction %!assert <*59226> (colperm ([1,0;0,0]), [2, 1])