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Calculate FFT from windowed time-based signal

I have a time-based signal (Raw signal) sampled at 6 MHz and need to analyze it in freq. domain. I'm learning DSP and this is very first time I work with DSP. Could you please help to check if this ...
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Matlab: speeding up repetitive initialisation with structured data?

I need to speed up this code: it creates a multilinear function. I considered the below methods but no idea which with the largest benefit. replacing dummy variables with things such as ...