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Given an array of data, is it necessary to use FFT to get the amplitude?

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Nina 2013-6-24

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采纳的回答： Iain

Hello all, I am given an array of data, first column represents the time data and the second represents a sin wave date (using the time data). I need to find the amplitude of the signal, do I need FFT for this? (I would know how to do it, i m just not sure if i need it), or shall I just use amp = sort(abs(2nd column of my array)

I am using Matlab here. Thank you.

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Iain 2013-6-24

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Try plotting it and seeing what that tells you...

(max(2nd column) - min(2nd column))/2 might make most sense ;)

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Nina 2013-6-25

Thank you, I will give this a try.

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MATLAB Mathematics Fourier Analysis and Filtering

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