There is any difference in matlab between normal calculations to discrete calculations ?

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shay afuta
shay afuta 2018-7-25
When I am trying to compute x*x*x (when * means convolution) I dont get the right answer.
X[n]=(7^n)heviside[-n] and I know that x*x*x=0.5(n-1)(n-2)(7^n)(heaviside[-n])=y[n]
my code is
syms n; X=(7^n)heviside(-n); y=conv(x)*conv(x)*conv(x);

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