issue_comments: 535969947

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https://github.com/pydata/xarray/issues/3343#issuecomment-535969947 https://api.github.com/repos/pydata/xarray/issues/3343 535969947 MDEyOklzc3VlQ29tbWVudDUzNTk2OTk0Nw== 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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