Fitting a smoothing spline method

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vedesh Mohit
vedesh Mohit 2018-4-2
回答： William Smith 2018-4-3
hey, I have a dataset x=[NaN 1 2 3 NaN NaN 4 7 9 NaN 8 28 8 ]; and I would to know how to fit a smoothing spline method to this data?

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William Smith
William Smith 2018-4-3
spline takes data in the format ( known X's, known Y's, desired X's)
So, for example:
desiredx=1:0.1:13;
xfitted = spline(1:numel(x), x, desiredx);
plot(desired, xfitted);
That's just a simple cubic spline. See also 'pchip', which has the same API. Smoothing splines more formally have a 'pressure' to penalise excessive curvature. If you need them, they're in the Curve Fitting Toolbox.

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