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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
1548355645 I_kwDOAMm_X85cSgg9 7456 xr.DataSet.expand_dims axis option doesn't work cmdupuis3 45972964 open 0     14 2023-01-19T00:58:01Z 2023-06-01T15:42:44Z   NONE      

What happened?

When I try to change the position of a new dimension added with expand_dims by setting the axis option, nothing happens.

What did you expect to happen?

I would expect this option to add new dimensions in the position I selected, as the documentation describes. I would expect setting axis=0 to give a result like this:

Frozen({'yomama': 1, 'a': 3, 'b': 3})

Minimal Complete Verifiable Example

Python da = xr.DataArray([[1,2,3],[4,5,6],[7,8,9]], coords={'a':[1,2,3], 'b':[1,2,3]}) ds = xr.Dataset({'da':da}) ds1 = ds.expand_dims('yomama', axis=0) print(ds1.dims) ds2 = ds.expand_dims('yomama', axis=2) print(ds2.dims)

MVCE confirmation

  • [X] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • [X] Complete example — the example is self-contained, including all data and the text of any traceback.
  • [X] Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • [X] New issue — a search of GitHub Issues suggests this is not a duplicate.

Relevant log output

Python Frozen({'a': 3, 'b': 3, 'yomama': 1}) Frozen({'a': 3, 'b': 3, 'yomama': 1})

Anything else we need to know?

No response

Environment

INSTALLED VERSIONS ------------------ commit: None python: 3.9.13 | packaged by conda-forge | (main, May 27 2022, 16:56:21) [GCC 10.3.0] python-bits: 64 OS: Linux OS-release: 5.10.133+ machine: x86_64 processor: x86_64 byteorder: little LC_ALL: C.UTF-8 LANG: C.UTF-8 LOCALE: ('en_US', 'UTF-8') libhdf5: 1.12.2 libnetcdf: 4.8.1 xarray: 2022.10.0 pandas: 1.5.0 numpy: 1.23.3 scipy: 1.9.1 netCDF4: 1.6.1 pydap: installed h5netcdf: 1.0.2 h5py: 3.7.0 Nio: None zarr: 2.13.3 cftime: 1.6.2 nc_time_axis: 1.4.1 PseudoNetCDF: None rasterio: 1.3.2 cfgrib: 0.9.10.2 iris: None bottleneck: 1.3.5 dask: 2022.10.0 distributed: 2022.10.0 matplotlib: 3.6.1 cartopy: 0.21.0 seaborn: 0.12.0 numbagg: None fsspec: 2022.8.2 cupy: None pint: 0.19.2 sparse: 0.13.0 flox: 0.6.0 numpy_groupies: 0.9.19 setuptools: 65.5.0 pip: 22.3 conda: None pytest: 7.1.3 IPython: 8.5.0 sphinx: None 
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     xarray 13221727 issue

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