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  • Interpolation using non-dimension coordinates · 4 ✖
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535969947 https://github.com/pydata/xarray/issues/3343#issuecomment-535969947 https://api.github.com/repos/pydata/xarray/issues/3343 MDEyOklzc3VlQ29tbWVudDUzNTk2OTk0Nw== dcherian 2448579 2019-09-27T14:44:17Z 2019-09-27T14:44:17Z MEMBER

More generally, this is about applying operations with non dimensional coordinates which need not be 1D. Thinking about API, how about adding a coord kwarg?

da.differentiate(dim="nx", coord="x")

This says use np.diff on da along dimension nx and divide by spacing calculated by np.diff on da.x along dimension nx

If x is 1D, then da.differentiate(coord="x") is equivalent to da.differentiate(dim="nx", coord="x") which is your proposal. i think this is cleaner and more explicit than automatically mapping 1D nondimensional coords to dimensions. 

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   Interpolation using non-dimension coordinates 498297720
535475540 https://github.com/pydata/xarray/issues/3343#issuecomment-535475540 https://api.github.com/repos/pydata/xarray/issues/3343 MDEyOklzc3VlQ29tbWVudDUzNTQ3NTU0MA== TomNicholas 35968931 2019-09-26T12:15:44Z 2019-09-26T12:15:44Z MEMBER

This is an example of a general UI problem which I was actually about to raise an issue about.

There are loads of places in xarray's API which require a dimension, but the operation would make just as much sense if a 1D coordinate were supplied instead (as that uniquely specifies a dimension).

I encountered the same kind of problem in #3334 with da.transpose().

I wonder if it would be possible to have a little helper function process the dim input to these functions and if it's a 1D coord, just demote it to the corresponding dim. 

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   Interpolation using non-dimension coordinates 498297720
535169724 https://github.com/pydata/xarray/issues/3343#issuecomment-535169724 https://api.github.com/repos/pydata/xarray/issues/3343 MDEyOklzc3VlQ29tbWVudDUzNTE2OTcyNA== equaeghe 601177 2019-09-25T19:13:46Z 2019-09-25T19:13:46Z NONE

you might be able to achieve what you want by using swap_dims

Yes, that is a nice workaround (I used another, less convenient one). But I would say that the current (lack of) functionality is a bug: the documentation talks about coordinates, not about dimensions. Moreover, it seems like something one would want to support. I do not know how complicated this would be to implement, but if reasonably feasible, I would request to keep this issue open.

 
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   Interpolation using non-dimension coordinates 498297720
535036214 https://github.com/pydata/xarray/issues/3343#issuecomment-535036214 https://api.github.com/repos/pydata/xarray/issues/3343 MDEyOklzc3VlQ29tbWVudDUzNTAzNjIxNA== keewis 14808389 2019-09-25T13:57:41Z 2019-09-25T13:57:41Z MEMBER

you might be able to achieve what you want by using swap_dims: python da.swap_dims({"dim": "nondim"}).interp(nondim=.5)

 
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   Interpolation using non-dimension coordinates 498297720

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