GilMoretto

Good morning, 
I am trying to get plot in 3d with Julia (IJ) using PyPlot(Matplotlib):
-----------
In[]: using PyPlot
      using PyCall
In[665]: function ot(tx, ty)
         (2*besselj1(sqrt((1600*pi*tx/(41253*l))^2 + (1600*pi*ty/(41253*l))^2))/
         (sqrt((1600*pi*tx/(41253*l))^2 + (1600*pi*ty/(41253*l)))^2))^2
         end
In[680]: step = 0.04