function f = frequency(vector)%FREQUENCY   Simbols frequencies%   For vectors, FREQUENCY(X) returns a [1x256] sized double array with frequencies%   of simbols 0-255.%%   For matrices, X(:) is used as input.%%   Input must be of uint8 type, while the output is a double array.%   $Author: Giuseppe Ridino' $%   $Revision: 1.1 $  $Date: 02-Jul-2004 16:30:00 $% ensure to handle uint8 input vectorif ~isa(vector,'uint8'),	error('input argument must be a uint8 vector')end% create ff = histc(vector(:), 0:255); f = f(:)'/sum(f); % always make a row of it