FFT of sine function

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Namira
Namira 2018-5-25
回答： sloppydisk 2018-5-25
I am trying to plot power of sine function. When I do FFT of sine wave I got two peaks for a single sin function. I don't know understand it. Why do I get two frequency spikes from a simple sin function via FFT? How can I get only one peak for a single sin function?

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sloppydisk
sloppydisk 2018-5-25
You'll get both positive and negative frequencies, see
doc fft
for an example of a single-sided spectrum, i.e. only positive frequencies.

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