Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / communications-1.1.1 / rleenco.m

diff --git a/octave_packages/communications-1.1.1/rleenco.m b/octave_packages/communications-1.1.1/rleenco.m
new file mode 100644 (file)
index 0000000..598d68b
--- /dev/null
+++ b/octave_packages/communications-1.1.1/rleenco.m
@@ -0,0 +1,55 @@
+## Copyright (C) 2006 Muthiah Annamalai <muthiah.annamalai@uta.edu>
+##
+## This program 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.
+##
+## This program 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
+## this program; if not, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} rleenco (@var{message})
+##
+## Returns  run-length encoded @var{message}. The
+## rle form is built from @var{message}. The original @var{message}
+## has to be in the form of a  row-vector. The encoded @var{message}
+## format (encoded RLE) is like  [repetition factor]+, values.
+##
+## An example use of @code{rleenco} is
+## @example
+## @group
+##          message=[    5   4   4   1   1   1]
+##          rleenco(message) #gives
+##          ans = [1 5 2 4 3 1];
+## @end group
+## @end example
+## @end deftypefn
+## @seealso{rleenco}
+
+function rmsg=rleenco(message)
+     if nargin < 1
+       error('Usage: rleenco(message)')
+     end
+     rmsg=[];
+     L=length(message);
+     itr=1;
+     while itr <= L
+       times=0;
+       val=message(itr);
+       while(itr <= L && message(itr)==val)
+        itr=itr+1;
+        times=times+1;
+       end
+       rmsg=[rmsg times val];
+     end
+     return
+end
+%!
+%!assert( rleenco([5 4 4 1 1 1]),[1 5 2 4 3 1])
+%!