How do you do a "moving 5pt 3rd order fit"?

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Sy
Sy 2012-6-12
I want to model the upshift of a curve using a moving 5pt 3rd order fit... Does anyone know how this is done?
Thanks in advance for any feedback you can give me!

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回答（2 个）

Walter Roberson
Walter Roberson 2012-6-12
A moving five point third order fit sounds to me like a cubic spline.
John D'Errico
John D'Errico 2012-6-12
I'm not sure what upshift means, at least not in context of a manual transmission for a car.
You can use conv or filter to do a moving fit, so a Savitsky-Golay filter of some sort. It depends on what you are looking for.
http://en.wikipedia.org/wiki/Savitzky–Golay_smoothing_filter
If by upshift, you really mean the slope of the curve, I have movingslope posted on the FEX. It alows you to specify the support of the Savitsky-Golay model, as well as the order.
http://www.mathworks.com/matlabcentral/fileexchange/16997-movingslope

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