function?[pattern]?=?rect_array（NxrNyrdolxrdolyrtheta0phi0winidwinnbits）;
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%?This?function?computes?the?3-D?directive?gain?patterns?for?a?plannar?array
%?This?function?uses?the?fft2?to?compute?its?output
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%?Nxr?==>?number?of?along?x-aixs;?Nyr?==>?number?of?elemnts?along?y-axis
%?dolxr?==>?element?spacing?in?x-direction;?dolyr?==>?element?spacing?in?y-direction?Both?are?in?lambda?units
%?theta0?==>?elevation?steering?angle?in?degrees?phi0?==>?azimuth?steering?angle?in?degrees
%?winid?==>?window?identifier;?winid?negative?==>?no?window?;?winid?positive?==>?use?window?given?by?win
%?win?==>?input?window