How do I graph a summation over an interval?

I have to plot this on the interval x E [-1,1] and x E [-0.1,0.1] for N=10. Can anyone help? I've tried symsum, but it doesn't work.

 Accepted Answer

n=(0:10).';
fcn=@(x)sum( (2/3).^n .* cos(9.^n.*(pi.*x)) );
fplot(fcn,[-1,1]/10)

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Asked:

on 21 Sep 2022

Commented:

on 21 Sep 2022

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