Fitting Curve passing through zero using CFTOOL

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Giuseppe Naselli
Giuseppe Naselli 2014-1-16
编辑： Mischa Kim 2014-1-16
Hi All,
below the data from a damper dyno test (attached). As you can see this shows some hysteresis.
I was interested in having only one curve passing basically in the middle (a sort of average between the bump and rebump stroke) I obtained this using the cftool (and help from the matworks answer:). In particular, I achieved that with the followings
% Create a smoothing spline fit with the parameter I specified
Fit_of_the_Data = fit(Velocity, Force, 'smoothingspline', 'SmoothingParam', 0.025)
% Create a variable with the point of the fit
Data_fitted = feval(Data_Fit,Velocity);
The fitting result is "more or less" fine (see below)
However, I wish my fitting curve to pass through zero . How can I do that?
Thanks in advance
G

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Mischa Kim
Mischa Kim 2014-1-16
编辑：Mischa Kim 2014-1-16
Hello Giuseppe,
you could use a simple, brute-force approach to get a little closer: add a couple of (0,0) data points to the force and velocity vectors and re-do the curve fitting. If forcing the curve through (0,0) does make sense for your application is something you need to decide.

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