Heavisde:

--------------------------------------------------------------------------
   Heavside function. H = 1 x „ 0, otherwise = 0

   Since version 1.
--------------------------------------------------------------------------
   Form:
   H = Heavisde( x )
--------------------------------------------------------------------------

   ------
   Inputs
   ------
   x                     Input

   -------
   Outputs
   -------
   H	                    Heaviside function

--------------------------------------------------------------------------