% unitStep
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% DESCRIPTION: Unit step function. In zero it returns 1.
%
% VERSION:     $Id: unitStep.m,v 1.1 2011/06/01 13:09:14 congedo Exp $
%
% HISTORY:     31-05-2011 G. Congedo
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

function y = unitStep(x)
  y = +(x>=0);
end