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>-----------------------------------------------------------------
> exa011004_sinc.m, for example 1.10.4
> to generate the sinc function.
> ²úÉúÒ» sinc º¯Êý£»
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clear;
n=200;
stept=4*pi/n;
t=-2*pi:stept:2*pi;
y=sinc(t);
plot(t,y,t,zeros(size(t)));
ylabel('sinc(t)');
xlabel('t=-2*pi~2*pi');
grid on;