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problem with CSAPS (cubic smoothing spline)

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I am having trouble using CSAPS function. Consider a slightly modified example from matlab manual
x = linspace(0,2*pi,21); y = sin(x)+(rand(1,21)-.5)*.1;
pp = csaps(x,y, .4)
Changing the smoothing parameter p, which is equal 0.4 in the case above, gives you different fitting curves. However, if I extend the range of data sites, say x=linspace(0,100*pi,21), then no matter which value of smoothing parameter p I use it gives me exactly the same curve. Conversely, if I shrink the interval then it gives me just a straight line irregardless of the p-value. Any thoughts?

Answers (1)

Isabella Osetinsky-Tzidaki
Your n=21 in linspace is too small for influencing your 0-100*pi range curve

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