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https://issues.apache.org/jira/browse/MATH-1632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17425922#comment-17425922
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Gili commented on MATH-1632:
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I wrongfully assumed that the constrained spline interpolator would have a
differentiable second derivative but looking at it now I don't think that's the
case. Worse, unless I am misreading the data I think I've seen it overshoot
values like cubic spline does. It's much more rare but it seems to still
happen. I will personally switch back to Akima. I guess we can close this
ticket as WON'T FIX.
> Constrained Spline Interpolator
> -------------------------------
>
> Key: MATH-1632
> URL: https://issues.apache.org/jira/browse/MATH-1632
> Project: Commons Math
> Issue Type: New Feature
> Affects Versions: 3.6.1
> Reporter: Gili
> Priority: Major
>
> Please add a constrained spline interpolator implementation.
> A description can be found at
> [https://pages.uoregon.edu/dgavin/software/spline.pdf]
> An existing Java implementation can be found at
> [https://jetcracker.wordpress.com/2014/12/26/constrained-cubic-spline-java/]
> Justification: This interpolation does not overshoot values like free cublic
> splines do.
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