Mercurial > octave
view scripts/statistics/runlength.m @ 33567:9f0f7a898b73 bytecode-interpreter tip
maint: Merge default to bytecode-interpreter
author | Arun Giridhar <arungiridhar@gmail.com> |
---|---|
date | Fri, 10 May 2024 17:57:29 -0400 |
parents | 2e484f9f1f18 |
children |
line wrap: on
line source
######################################################################## ## ## Copyright (C) 2005-2024 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 {} {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 <Invalid call> runlength () %!error runlength (['A'; 'B']) %!error runlength (ones (2,2))