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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)