How to plot this signal?

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I'm trying to plot this signal but I'm not sure where to start.
y(n) = ax(n) + bx(n 1) + cx(n 2)
where a=b=c=1/3

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Honglei Chen
Honglei Chen 2014-9-12
编辑:Honglei Chen 2014-9-12
y = filter([a b c],1,x);
plot(y)

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