Mercurial > octave
view scripts/statistics/base/runlength.m @ 23084:ef4d915df748
maint: Merge stable to default.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 23 Jan 2017 14:27:48 -0500 |
parents | 3a2b891d0b33 e9a0469dedd9 |
children | 092078913d54 |
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## Copyright (C) 2005-2016 Paul Kienzle ## ## 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 {} {count =} runlength (@var{x}) ## @deftypefnx {} {[count, value] =} runlength (@var{x}) ## Find the lengths of all sequences of common values. ## ## @var{count} is a vector with the lengths of each repeated value. ## ## The optional output @var{value} contains the value that was repeated in ## the sequence. ## ## @example ## @group ## runlength ([2, 2, 0, 4, 4, 4, 0, 1, 1, 1, 1]) ## @result{} [2, 1, 3, 1, 4] ## @end group ## @end example ## @seealso{run_count} ## @end deftypefn function [count, value] = runlength (x) if (nargin != 1) print_usage (); endif if (! (isnumeric (x) || islogical (x)) || ! isvector (x)) error ("runlength: X must be a numeric vector"); endif if (iscolumn (x)) x = x.'; endif idx = [find(x(1:end-1) != x(2:end)), length(x)]; count = diff ([0 idx]); if (nargout == 2) value = x(idx); endif endfunction %!assert (runlength ([2 2 0 4 4 4 0 1 1 1 1]), [2 1 3 1 4]) %!assert (runlength ([2 2 0 4 4 4 0 1 1 1 1]'), [2 1 3 1 4]) %!test %! [c, v] = runlength ([2 2 0 4 4 4 0 1 1 1 1]); %! assert (c, [2 1 3 1 4]); %! assert (v, [2 0 4 0 1]); ## Test input validation %!error runlength () %!error runlength (1, 2) %!error runlength (['A'; 'B']) %!error runlength (ones (2,2))