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 axes
windowWidth = 27; %Standard example values
polynomialOrder = 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 on
plot3(points(:,1),points(:,2),points(:,3),'bo')
plot3(xyzsg(:,1),xyzsg(:,2),xyzsg(:,3),'gx')
hold off

ANSWER

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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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