issues: 1384465119

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1384465119 I_kwDOAMm_X85ShULf 7076 Can't unstack concatenated DataArrays 22566757 open 0     9 2022-09-24T00:50:09Z 2023-02-21T17:11:35Z   CONTRIBUTOR      

What happened?

I had a collection of DataArrays with a stacked dimension (dimension whose corresponding index is a MultiIndex). I concatenated them into a single DataArray, then tried to unstack the stacked dimension, which failed. Performing the operations in the other order works (unstacking each DataArray, then concatenating the unstacked arrays).

What did you expect to happen?

I expected that concatenating the arrays then unstacking them would produce the same array as unstacking them then concatenating them, but with the possibility of saving the intermediate concatenated-but-still-stacked DataArray for later use as a template.

Minimal Complete Verifiable Example

```Python import pandas as pd import xarray index = pd.MultiIndex.from_product([range(3), range(5)]) arr = xarray.DataArray.from_series(pd.Series(range(15), index=index)).stack(index0=["level_0", "level_1"]) arr.unstack("index0")

arr2 = xarray.concat([arr, arr], dim="index2") arr2.unstack("index0") ```

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 <xarray.DataArray (level_0: 3, level_1: 5)> array([[ 0, 1, 2, 3, 4], [ 5, 6, 7, 8, 9], [10, 11, 12, 13, 14]]) Coordinates: * level_0 (level_0) int64 0 1 2 * level_1 (level_1) int64 0 1 2 3 4

Traceback (most recent call last): File "<stdin>", line 1, in <module> File "~/.conda/envs/plotting/lib/python3.10/site-packages/xarray/core/dataarray.py", line 2402, in unstack ds = self._to_temp_dataset().unstack(dim, fill_value, sparse) File "~/.conda/envs/plotting/lib/python3.10/site-packages/xarray/core/dataset.py", line 4618, in unstack raise ValueError( ValueError: cannot unstack dimensions that do not have exactly one multi-index: ('index0',) ```

Anything else we need to know?

The eventual problem to which I wish to apply the solution has two stacked dimensions rather than one, but that's likely irrelevant.

Environment

INSTALLED VERSIONS ------------------ commit: None python: 3.10.6 | packaged by conda-forge | (main, Aug 22 2022, 20:35:26) [GCC 10.4.0] python-bits: 64 OS: Linux OS-release: 3.10.0-1160.76.1.el7.x86_64 machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: ('en_US', 'UTF-8') libhdf5: 1.12.1 libnetcdf: 4.8.1 xarray: 2022.6.0 pandas: 1.4.2 numpy: 1.22.3 scipy: 1.8.0 netCDF4: 1.6.0 pydap: None h5netcdf: None h5py: None Nio: None zarr: None cftime: 1.5.1.1 nc_time_axis: None PseudoNetCDF: None rasterio: None cfgrib: None iris: 3.2.1.post0 bottleneck: 1.3.5 dask: 2022.7.1 distributed: 2022.7.1 matplotlib: 3.5.1 cartopy: 0.20.3 seaborn: 0.12.0 numbagg: None fsspec: 2022.5.0 cupy: None pint: None sparse: None flox: None numpy_groupies: None setuptools: 61.3.1 pip: 22.0.4 conda: 4.14.0 pytest: 7.1.3 IPython: None sphinx: None 
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   reopened 13221727 issue

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