Jake Vanderplas

I think this is because master is broken. The entire module is in a weird inbetween state right now, unfortunately...

> A proper v0.2 release would be beneficial. Agreed. If anybody wants to work on that, they are welcome to!

Also, pdvega v0.1 predated Altair, so if binder is tied to that then Altair shouldn't be a requirement.

``org_sel`` is undefined in your example

I think it's a Vega-Lite bug: the ``empty='none'`` and ``empty='all'`` specifications don't seem to influence logical operations over selections. I'd suggest opening a Vega-Lite issue.

Layered plots are available in master: That said, I don't think twin axes in the way you're thinking about them (i.e. two different scales on one plot) will be supported,...

Thanks @domoritz – sorry to put words in your mouth :grin: I'll think about how we might support this in pdvega while sticking to the pandas-like interface. I don't want...

Copying the code in question: ```python import pandas as pd import altair as alt source = pd.DataFrame({'age': ['12', '32', '43', '54', '32', '32', '12']}) alt.Chart(source).transform_joinaggregate( total='count(*)' ).transform_calculate( pct='1 / datum.total'...

Yes, see the examples at https://altair-viz.github.io/user_guide/transform/calculate.html

Hmm... I think so? In any case the datasets need to be part of http://github.com/vega/vega-datasets/ before they can be included here.