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## Copyright (C) 2005-2013 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 {Function File} {[count, value] =} runlength (@var{x})
## Find the lengths of all sequences of common values. Return the
## vector of lengths and the value that was repeated.
##
## @example
## @group
## runlength ([2, 2, 0, 4, 4, 4, 0, 1, 1, 1, 1])
## @result{} [2, 1, 3, 1, 4]
## @end group
## @end example
## @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))
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