issues: 718716799
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| 718716799 | MDU6SXNzdWU3MTg3MTY3OTk= | 4501 | Scalar non-dimension coords forget their heritage | 1053153 | open | 0 | 7 | 2020-10-10T22:44:25Z | 2023-09-22T04:50:34Z | CONTRIBUTOR | I'm not sure if this is a bug or a feature, to be honest. I noted that expanded scalar coordinates would retain their scalar values, and so thought that non-dimension coordinates might keep their references to each other and do the same. What happened: When a dimension is squeezed or selected with a scalar, the associated non-dimension coordinates are unassociated from the dimension. When the dimension is expanded later, the previously associated non-dimension coordinates are not expanded. What you expected to happen: The previously associated non-dimension coordinates should be expanded. Minimal Complete Verifiable Example: ```python import numpy as np import xarray as xr arr1 = xr.DataArray(np.zeros((1,5)), dims=['y', 'x'], coords={'e': ('y', [10])}) arr2 = arr1.squeeze('y').expand_dims('y') xr.testing.assert_identical(arr1, arr2) ``` Error: ``` AssertionError: Left and right DataArray objects are not identical Differing coordinates: L e (y) int64 10 R e int64 10 ``` Taken another way, I would desire these statements to be possible:
Environment: Output of <tt>xr.show_versions()</tt>INSTALLED VERSIONS ------------------ commit: None python: 3.8.5 (default, Jul 28 2020, 12:59:40) [GCC 9.3.0] python-bits: 64 OS: Linux OS-release: 5.4.0-48-generic machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: en_US.UTF-8 libhdf5: 1.10.4 libnetcdf: None xarray: 0.16.1 pandas: 1.1.3 numpy: 1.19.2 scipy: 1.5.2 netCDF4: None pydap: None h5netcdf: None h5py: 2.10.0 Nio: None zarr: 2.5.0 cftime: None nc_time_axis: None PseudoNetCDF: None rasterio: None cfgrib: None iris: None bottleneck: None dask: 2.30.0 distributed: 2.30.0 matplotlib: 3.3.2 cartopy: None seaborn: 0.11.0 numbagg: None pint: None setuptools: 50.3.0 pip: 20.2.3 conda: None pytest: 6.1.1 IPython: 7.18.1 sphinx: 3.2.1 |
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13221727 | issue |