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//Chapter 5: Point Source and Their Arrays
//Example 5-6.4
clc;
clear;
//Variable Initialization
Um=1 //Maximum radiation intensity (unitless)
deff('z=f(x,y)','z=sin(x)**3')//Integrand(Unitless)
X=[0 0;%pi %pi;%pi 0];
Y=[0 0;2*%pi 2*%pi;0 2*%pi];
[I,err]=int2d(X,Y,f)//Total power radiated (relative to Um)
D=(4*%pi)/I //Directivity (unitless)
mprintf('The directivity is %.1f',D)
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