best way to detect sinusoidal pattern
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What is the best way to filter patterns that looks like a sine wave e.g the 1st one is selected and the last one is filtered out
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John D'Errico
2014-2-25
编辑：John D'Errico
2014-2-25
1 个投票
Neither of these is truly sinusoidal. At best, you might say the first has an oscillatory behavior. Note that the first one has a strong semi-linear trend in it too. But sinusoidal? Not so. And if it is not actually sinusoidal, your question becomes a bit moot, as now one can only ask about the amplitude of semi-periodic behavior.
So if you wanted that, then you might consider an FFT. See what it can tell you about those patterns. For example, if you saw a strong amplitude at some frequency, what might it tell you?
Or perhaps the wavelet toolbox might be even more appropriate for your purposes.
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2014-2-25
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