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altair-viz / altair-transform

Evaluation of Vega-Lite transforms in Python
MIT License
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Implement Vega-Lite 4.0 transforms #6

Open jakevdp opened 4 years ago

jakevdp commented 4 years ago

Vega-Lite 4.0 adds a number of additional transforms, including density, loess, pivot, quantile, and regression. These can't be fully supported until Altair 4.0 comes out, but we could start implementing them before that.

robna commented 3 years ago

I was wondering if for these transforms the calculated values will now be accessible, as the current release of altair is 4.1.0? Especially I would like to extract the values of a density transform, but get the NotImplementedError.

My current way around is to calculate a KDE outside of altair (using SKLearn, as @jakevdp recommended here). But it would be great if I was able to do it from altair directly because of the easy groupby functionality it provides.

jakevdp commented 3 years ago

Some of these transforms have been implemented on master, but there hasn't been a release of this package for a while/