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📄 sinc2.m

📁 很多matlab的源代码
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function y = sinc2(x)
% SINC2 Sinc-squared Function.
%
%       Y=SINC2(X) generates [sin(pi*x)/(pi*x)]^2
%
%       SINC2 (with no input arguments) invokes the following example:
% 
%         % Compare and plot sinc(t) and sinc2(t) over -3 to 3
%         >>t=-3:.02:3;
%         >>ys=sinc(t);
%         >>ys2=sinc2(t);
%         >>plot(t,ys,t,ys2)
%         >>grid


% ADSP Toolbox: Version 2.0 
% For use with "Analog and Digital Signal Processing", 2nd Ed.
% Published by PWS Publishing Co.
%
% Ashok Ambardar, EE Dept. MTU, Houghton, MI 49931, USA
% http://www.ee.mtu/faculty/akambard.html
% e-mail: akambard@mtu.edu
% Copyright (c) 1998


if nargin==0,
 help sinc2
 disp('Strike a key to see results of the example')
 pause
 t=-3:.02:3;
 ys=sinc(t);
 ys2=sinc2(t);
  v=matverch;
 if v < 4, eval('clg');else,eval('clf');end

 plot(t,ys,t,ys2)
 grid
 return
end

if nargin == 1,
y=sinc(x);
% x=pi*x;
% i=find(x==0);
% [m,n]=size(i);
% x(i)=ones(m,n);
% y=sin(x)./x;
% y(i)=ones(m,n);
 y=y.*y;
elseif nargin > 1,
 error('Too many input arguments');
end

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