how to create discrete heaviside

Hi every one. I need to create a discrete pulse and then find&plot its z-transformation.Usual heaviside is not working propely( x[0]=1/2 ) and i dont really see another way then heaviside. any tip would help... thx.

Answer 1

[Rick Rosson]

   N = 200;
   k = 1:N;
   p = 15;
   x = (k > p);

   figure;
   stairs(k,x);