# Savitsky-Golay Filter Problem — Smoothing 3D line

I wanted to smooth a 3d line using the Savitzky-Golay filter, but for this example is seems to not work properly. Any ideas why, and how to fix it?

`% Savitzky–Golay filter (sgolayfilt) - smoothing individual axeswindowWidth = 27;    %Standard example valuespolynomialOrder = 3;xsg=sgolayfilt(points(:,1),polynomialOrder, windowWidth);ysg=sgolayfilt(points(:,2),polynomialOrder, windowWidth);zsg=sgolayfilt(points(:,3),polynomialOrder, windowWidth);xyzsg = [xsg,ysg,zsg];clf()hold onplot3(points(:,1),points(:,2),points(:,3),'bo')plot3(xyzsg(:,1),xyzsg(:,2),xyzsg(:,3),'gx')hold off`

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How many elements are in your array? 27 looks like an incredibly wide window for your data. I would have used a width of 5 to 9 elements. Try that and see how it works out.

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Simple! That is me, a simple person. I am passionate about knowledge and reading. That’s why I have decided to write and share a bit of my life and thoughts to.