Interpolate based on other Float64 column about polars HOT 5 CLOSED

Hi All. I’ve started working on this. Will have Marco review PR when it’s done. I am also planning on adding an extrapolate option, looking to match default behavior of np.interp

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Sure, thanks - just noting though that even if Float64 type was allowed, it wouldn't automatically unlock the linked scipy methods, as only linear interpolation is currently supported

I'll take a look at supporting Float64 (not high priority though)

Regarding the scipy functions, maybe that's an idea for a polars plugin - polars-interpolate, with lots of fancy interpolation methods which might be out-of-scope for Polars itself

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hi @MKDJr

i'm not sure I understand the request, as you can't currently pass a scipy method to interpolate_by? could you clarify please?

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Sure! My request is to expand the accepted types for the by argument of interpolate_by to include the Float64 type.

I can see how the initial request was unclear. Thanks for the quick response!

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Just want to upvote! Was very happy to see interpolate_by but my first use I'm interpolating by floats (Temperatures...) - I worked around by casting/dividing but this will greatly increase flexibility.

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