How to plot the frequency response of a discrete cosine function?
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My attempt:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/151717/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/151718/image.png)
I tried doing it but I can't get the freq response to be plotted between pi and pi. Any help would be appreciated.
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Rick Rosson
2015-11-14
编辑:Rick Rosson
2015-11-14
L = 1000;
n = 0:L-1;
x1 = fftshift(fft(x))/L;
dw = 2*pi/L;
w = -pi:dw:pi-dw;
stem(w,mag);
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