issue_comments: 275721597

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https://github.com/pydata/xarray/issues/1234#issuecomment-275721597 https://api.github.com/repos/pydata/xarray/issues/1234 275721597 MDEyOklzc3VlQ29tbWVudDI3NTcyMTU5Nw== 1217238 2017-01-27T17:23:03Z 2017-01-27T17:23:03Z MEMBER

You're not the first person to be confused about this (see https://github.com/pydata/xarray/issues/1217). This is indeed working as expected, though maybe not in the most useful way.

where works by broadcasting its arguments, and when ds.c (along the a dimension) gets broadcasted with ds.y (along the b dimension), the result gets the union of both dimensions.

Alternatively, we might simply skip variables in Dataset.where if they don't have overlapping dimensions. The logic gets a good deal more complex, though. Currently where is a thin wrapper around np.where.

 
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