Interpolations.jl: The API may be clever, but it isn’t easy to use. How do I interpolate a set of points with a cubic curve? I tried this: npts = size(xyz,1); s = fill(0.0, npts); for j in 2:npts s[j] = s[j-1]+norm(xyz[j,:]-xyz[j-1,:]); end CubicSplineInterpolation((s,), …

There is also GitHub - slabanja/SimplePCHIP: Simple monotone piecewise cubic interpolation .

I think Interpolations.jl only supports unequally spaced points for linear interpolation? You might try https://github.com/kbarbary/Dierckx.jl SimplePCHIP might be a good reference for a Julia Hermite interpolation package, but it is a bit out of date and the implementation looks rather Pythonic (…

Thanks for the hint, I tried to browse through the tests and it looks like you are right. It doesn’t work for cubic curves.

[image] stevengj: You might try https://github.com/kbarbary/Dierckx.jl Beautiful! Why can’t Interpolations.jl be so simple to use?

Thanks. This is good to know, but for my present purpose the PCHIP is too flat inbetween the control points. I really do prefer the regular spline in this case.

[image] GitHub - SciML/DataInterpolations.jl: A library of data interpolation and... A library of data interpolation and smoothing functions - GitHub - SciML/DataInterpolations.jl: A library of data interpolation and smoothing functions https://htmlpreview.gi…

Dierckx.jl? It is an easy to use package, but I don’t know about unequally spaced data.

I agree that Interpolations.jl should be reworked to be easier to use. It could really use a dedicated maintainer. It’s a nicely-isolated package (it doesn’t require you to maintain an entire ecosystem), mathematically interesting, and has huge implications for the community. Volunteers wanted!

I would like to contribute more to the Julia community but I’m not sure I would be qualified to be a maintainer. I wouldn’t mind focusing my extra time on contributing to the package rework though.

That would be awesome. I’ve been trying to review PRs to Interpolations when I can find the time; if you submit a few, not only will you be helping make it better but you’ll be in training for having more authority over the direction of the package.

Cubic interpolation

General Usage

tim.holy April 12, 2020, 6:32pm 14

It’s official: Interpolations.jl needs a new maintainer

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Cubic interpolation

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