assign new dimension of length one

Question

I have a DataArray for which da.dims==(). I can assign a coordinate da.assign_coords(foo=42). I would like to add a corresponding dimension with length one, such that da.dims==("foo",) and the corresponding coordinate would be foo=[42]. I cannot use assign_coords(foo=[42]), as this results in the error message cannot add coordinates with new dimensions to a DataArray.

How do I assign a new dimension of length one to a DataArray? I could do something like DataArray(da.values.reshape([1]), dims="foo", coords={"foo": [42]}) but I wonder if there is a method that does not require copying the entire object.

Related: http://stackoverflow.com/questions/34987972/expand-dimensions-xray — gerrit, Mar 24 '17 at 15:06

score 1 · Accepted Answer · answered Mar 24 '17 at 12:30

1

You can use xarray.concat to achieve this:

da = xarray.DataArray(0, coords={"x": 42})
xarray.concat((da,), dim="x")

answered Mar 24 '17 at 12:30

gerrit

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assign new dimension of length one

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