Hello Is there KMath analog for org apache commons math3 ana

Question

Hello Is there KMath analog for org apache commons math3 analysis interpolation PiecewiseBicubicSplineInterpolatingFunction

altavir · Answer

I did not work on 2D interpolation There is a wrapper for commons math in <https github com SciProgCentre kmath tree dev kmath commons> but it does include 2d interpolation Could you please create an issue with a problem description so we can add either wrapper or multiplatform implementation in the next release

altavir · Answer

Contributions are welcome as always There is a more or less stable API for 1D interpolation here <https github com SciProgCentre kmath blob 784d397ab12103bae441d770b8ee6c2f8e0c03c3 kmath functions src commonMain kotlin space kscience kmath interpolation Interpolator kt L29|https github com SciProgCentre kmath blob 784d397ab12103bae441d770b8ee6c2f8e0c03 nMain kotlin space kscience kmath interpolation Interpolator kt> I am not sure if it is good for 2d interpolation

altavir · Answer

Actually it shoul work with Vector2D for X

altavir · Answer

The problem with 2D interpolation is that it is not clear how the data and result are represented For example numpy uses bizarre meshes but as far as I can remember it could not handle non uniform points

PHondogo · Answer

Alexander thanks for answering I m developing Kotlin multiplatform project for working with surfaces Surface is given by points matrix and to be able to render it at any scale I need to interpolate Now client is using Jetpack Compose Canvas working in JVM Desktop and Android for now For interpolation I m using PiecewiseBicubicSplineInterpolatingFunction by Apache Commons Math Now I m trying to adopt it for JS target and looking for math multiplatform library

altavir · Answer

I usually just take Commons Math code and port it to multiplatform generifying and optimizing it along the way CM bicubic spline seems to be a thin wrapper on top of 1D spline interpolator And spline interpolator is already implemented in the multiplatform

altavir · Answer

I can add it in a week or so and create a dev release But Issue with a problem description would be also nice

PHondogo · Answer

Where should I file an issue

altavir · Answer

<https github com SciProgCentre kmath issues> We plan to move to our YouTrack for that But I do not have any specific timeline

PHondogo · Answer

PHondogo · Answer

Thanks