issues: 352999600

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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
352999600 MDU6SXNzdWUzNTI5OTk2MDA= 2377 Comparing scalar xarray with ma.masked fails with ValueError: assignment destination is read-only 500246 closed 0     5 2018-08-22T15:11:54Z 2023-05-17T16:06:01Z 2023-05-17T16:06:01Z CONTRIBUTOR      

Code Sample, a copy-pastable example if possible

python xarray.DataArray(0) > numpy.ma.masked

Problem description

This results in ValueError: assignment destination is read-only:

```

ValueError Traceback (most recent call last) <ipython-input-102-f6226708b971> in <module>() ----> 1 xarray.DataArray(0) > numpy.ma.masked

/group_workspaces/cems2/fiduceo/Users/gholl/anaconda3/envs/FCDR37a/lib/python3.7/site-packages/xarray/core/dataarray.py in func(self, other) 1808 1809 variable = (f(self.variable, other_variable) -> 1810 if not reflexive 1811 else f(other_variable, self.variable)) 1812 coords = self.coords._merge_raw(other_coords)

/group_workspaces/cems2/fiduceo/Users/gholl/anaconda3/envs/FCDR37a/lib/python3.7/site-packages/xarray/core/variable.py in func(self, other) 1580 if not reflexive 1581 else f(other_data, self_data)) -> 1582 result = Variable(dims, new_data) 1583 return result 1584 return func

/group_workspaces/cems2/fiduceo/Users/gholl/anaconda3/envs/FCDR37a/lib/python3.7/site-packages/xarray/core/variable.py in init(self, dims, data, attrs, encoding, fastpath) 260 unrecognized encoding items. 261 """ --> 262 self._data = as_compatible_data(data, fastpath=fastpath) 263 self._dims = self._parse_dimensions(dims) 264 self._attrs = None

/group_workspaces/cems2/fiduceo/Users/gholl/anaconda3/envs/FCDR37a/lib/python3.7/site-packages/xarray/core/variable.py in as_compatible_data(data, fastpath) 177 dtype, fill_value = dtypes.maybe_promote(data.dtype) 178 data = np.asarray(data, dtype=dtype) --> 179 data[mask] = fill_value 180 else: 181 data = np.asarray(data)

ValueError: assignment destination is read-only ```

Expected Output

To be consistent, the result should be identical to the result of

(xarray.DataArray([0,0]) > numpy.ma.masked)[0]

which would be

xarray.DataArray(nan)

Output of xr.show_versions()

xarray.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: 1.14.5 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: 2.2.2 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 13221727 issue

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