Mercurial > octave-nkf
view scripts/sparse/colperm.m @ 20611:40ed9b46a800
new octave_value::string_value method with optional error message
* ov.h (octave_value::string_vector): New method.
ov-base.cc, ov-base.h (octave_base_value::string_vector):
New default method.
ov-str-mat.cc, ov-str-mat.h (octave_char_matrix_str::string_value):
New method.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Thu, 08 Oct 2015 16:43:22 -0400 |
parents | df437a52bcaf |
children |
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## Copyright (C) 2004-2015 David Bateman and 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/>. ## -*- texinfo -*- ## @deftypefn {Function File} {@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 nonzeros elements. ## @end deftypefn function p = colperm (s) if (nargin != 1) print_usage (); endif [i, j] = find (s); idx = find (diff ([j; Inf]) != 0); [dummy, p] = sort (idx - [0; idx(1:(end-1))]); endfunction