Smoothing data with sgolay filter

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Prayander Sahatma Siahaan
回答： Star Strider 2022-9-27
Hi i have a question, if i have a code like this before,
smootheddata = smoothdata(z,"sgolay", "SmoothingFactor",0.25 );
how i exprese it in sgolay function ? Thank you

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回答（2 个）

Chunru
Chunru 2022-9-27
编辑：Chunru 2022-9-27
framelen = 11; order = 3; % adjust these values
smootheddata = sgolayfilt(z, order, framelen);
Star Strider
Star Strider 2022-9-27
The default order for the 'sgolay' option is 2 (quadratic), however the 'SmoothingFactor' controls the window length (framelen in the sgolayfilt documentation), it has no exact definition, so an exact translation to sgolayfilt parameters is not possible for it.
For sgolayfilt I generally choose an order of 3 and an initial framelen value of 5% of the signal length. I then adjust the framelen value to get the result I want. It is possible to control these in the smoothdata function by setting the 'Degree' and window parameters.

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