HI, How can I plot Power Spectrum from a Time Series data?

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ramin asadi
ramin asadi 2017-6-20
评论： Star Strider 2017-6-20
I have 10000 Pressure data in 0.5 sec (i.e frequency =20000), I want to plot power spectrum in which x axis is f(Hz) and y axis be Amplitude.

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Star Strider
Star Strider 2017-6-20
The power spectral density is the square of the absolute value of the Fourier transform of your data. See the documentation on fft (link) for details.
The Signal Processing Toolbox has other functions that will do what you want. See the documentation on Spectral Analysis (link) for details on them. There are links to the various functions in the documentation.
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ramin asadi
ramin asadi 2017-6-20
thank you very much. it is solved. and do you know how can I plot Poincare Section of the Phase Portrait?
Star Strider
Star Strider 2017-6-20
My pleasure.
I have not done anything with chaos theory in decades. I found poincare.m (link) when I searched. It should provide some guidance.

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