Math Forum Discussions

Greg Heath

Posts: 5,696
Registered: 12/7/04

Re: The DFT of a Rectangular Window & The Effects of Zero Padding a Signal
Posted: Jan 19, 2013 1:36 AM

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"PUPR" wrote in message <kdc5ko$l5m$1@newscl01ah.mathworks.com>...
> Hello, I'm new at MatLab. I need help solving the following examples. I use the command "doc" to access the library, but I'm not shore if it is correct how I implement the commands. I try to solve the first example:
>
> 1) Plot the 4-point magnitude DFT of the following pulse w[n] = [0,1,2,3]
> (Use the FFT command in MATLAB.)
>
> dft_data = [0,1,2,3];
> FF_T=fft(dft_data);
> m = abs (FF_T);
> stem(m);
>
> 2) Conveniently zero pad the signal in order to plot the 8-point DFT, the 16-point DFT and the 128-point DFT.

Try

help fft

Greg