Dealing with NaN values in FFT
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noam edelshtein
am 25 Jul. 2020
Kommentiert: Star Strider
am 9 Feb. 2022
Hi, I'm working with a large data set of voxel information from MRI scans of multiple subjects, and as part of the analysis I use FFT. Prior to this, the data already goes through some modifications, removing specific values deemed too low (insignificant data) and replacing it with NaN values. After checking the results I realized there is an issue with FFT and NaN values. Is there some solution or workaround that someone perhaps knows that might help resolve this issue?
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Sugar Daddy
am 25 Jul. 2020
what if you remove NaNs from dataset
Suppose
X = [1 2 3 NaN 3 2 1];
X(isnan(X)) = []
X =
1 2 3 3 2 1
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Maya Eyal
am 22 Feb. 2021
I think this solution is not good, since it destroys the pattern in the data, and the whole reason we use the fft is to find the pattern.
I'm not an expert, just another one with the same NaN problem.
I'm not sure that interpulating the missing data will give me the pattern I want to find, but it seems I have no choice.
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