Identify decaying or growing sinusoidal graph

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Joseph 2012-6-11

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采纳的回答： Anton Semechko

I have a data set which either grows or decays over time.

The graphed data set looks like a sinusoidal graph with its amplitude either growing or decreasing over time.

What is the easiest way to identify if the overall trend is growing or decaying over time.

Thanks !

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Anton Semechko 2012-6-11

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find the peaks, order them according to time and compare their magnitudes. see:

http://www.mathworks.com/matlabcentral/fileexchange/11755-peak-finding-and-measurement

or

http://www.mathworks.com/matlabcentral/fileexchange/25500-peakfinder

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