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>----------------------------------------------------------------------------
> exa030102, for example 3.1.2
> to obtain the Fourier transform of a continuous rectangle signal;
> 计算连续方波信号的付里叶变换
>----------------------------------------------------------------------------
clear all；
> 下面说明如何画出一个sinc函数；
tao=0.2;A=5;
s=pi*tao;
A1=A*tao;
for f=1:60
f1=f-30;
sf1=s*f1;
if sf1==0;
x(f)=1;
else
x(f)=sin(sf1)/sf1;
end
end
f=-29:30;
subplot(211)
plot(f,x,f,zeros(size(x)));grid on