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i have magnetics field data, and i have to change the data from time domain to frequency domain, so i will use fft. but, i don't know how to write the code

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Star Strider
Star Strider il 4 Feb 2016
Modificato: Star Strider il 4 Feb 2016
See the R2015a documentation for fft (<— link). Note especially the code between the top two plot figures. It has everything you need.

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