how to find fft
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hai frnds,
i have 7653 values for bond length of OH bond in water during spectral analysis.so now the next step is to find the fft of the bond length.value of time varies as (0:.725:5548.425).please generate the code for me.I am stucked
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Behind The Sciences
il 18 Apr 2016
Have a look to this post to understand what you want to do: http://www.behindthesciences.com/signal-processing/fouriertransformtheory
Then,have a look to this post to get code that you need: http://www.behindthesciences.com/signal-processing/fouriertransformmatlabtutorial
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Star Strider
il 18 Apr 2016
See this documentation for the fft function. The code between the top two plot figures has everything you need to analyse and plot your Fourier transformed data.
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Star Strider
il 19 Apr 2016
The frequencies sort themselves.
To find the peaks and the associated frequencies, use the findpeaks function on the absolute value of the fft, just as you plotted them here.
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