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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
376104925 MDU6SXNzdWUzNzYxMDQ5MjU= 2529 numpy.insert on DataArray may silently result in array inconsistent with its coordinates gerritholl 500246 closed 0     1 2018-10-31T18:33:23Z 2020-11-07T21:55:42Z 2020-11-07T21:55:42Z CONTRIBUTOR      

```python import numpy import xarray

da = xarray.DataArray(numpy.arange(103).reshape(10, 3), dims=("x", "y"), coords={"foo": (("x", "y"), numpy.arange(310).reshape(10,3))})

print(da.shape == da["foo"].shape)

da2 = numpy.insert(da, 3, 0, axis=0)

print(da2.shape == da2["foo"].shape) ```

Problem description

Running the code snippet gives

True False

and does not raise any exception. In the resulting da2, the shape for da2 and da2['foo'] are different: we have changed the size of da2 without changing the size of its corresponding foo coordinate. This happens silently, no exception is thrown. Inevitably, this is likely to result in problems at a later stage.

Expected Output

I would expect to get an exception, telling me that the insertion has failed because there are coordinates associated with the axis along which we are inserting values. It would be nice to have an xarray.insert that can handle this, for example, by forcing us to provide corresponding insertion values for the coordinates.

Output of xr.show_versions()

INSTALLED VERSIONS ------------------ commit: None python: 3.7.0.final.0 python-bits: 64 OS: Linux OS-release: 2.6.32-754.el6.x86_64 machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: en_GB.UTF-8 LOCALE: en_GB.UTF-8 xarray: 0.10.7 pandas: 0.23.2 numpy: 1.15.2 scipy: 1.1.0 netCDF4: 1.4.0 h5netcdf: 0.6.1 h5py: 2.8.0 Nio: None zarr: None bottleneck: 1.2.1 cyordereddict: None dask: 0.18.1 distributed: 1.22.0 matplotlib: 3.0.0 cartopy: 0.16.0 seaborn: 0.9.0 setuptools: 39.2.0 pip: 18.0 conda: None pytest: 3.2.2 IPython: 6.4.0 sphinx: None 
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   completed xarray 13221727 issue

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