ploting issues in program

[Peter Otten]

Steve Holden wrote:

> I might ask just exactly what is being plotted to give those answers. It
> sounds like field strength, but I am having difficulty envisaging a
> field that is weakest at its center - is this some sort of alternative
> universe you are plotting :-) ?

I believe the OP is trying to plot a radiation pattern like Figure 4.5 on
the following page:

http://www.vias.org/wirelessnetw/wndw_06_05_05.html

Peter