How to plot the frequency response of a discrete cosine function?

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My attempt:
I tried doing it but I can't get the freq response to be plotted between pi and pi. Any help would be appreciated.

Answers (1)

Rick Rosson
Rick Rosson on 14 Nov 2015
Edited: Rick Rosson on 14 Nov 2015
L = 1000;
n = 0:L-1;
x1 = fftshift(fft(x))/L;
dw = 2*pi/L;
w = -pi:dw:pi-dw;

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