issues: 2109180364

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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
2109180364 I_kwDOAMm_X859t4nM 8685 Wrong sum of boolean negation 4087525 closed 0     3 2024-01-31T02:52:31Z 2024-01-31T12:58:32Z 2024-01-31T12:58:32Z NONE      

What happened?

I get the wrong answer when I chain boolean negation with sum(). It works when I put parentheses around the negation, or when I first write the negation result to a new variable. See code example.

What did you expect to happen?

No response

Minimal Complete Verifiable Example

```Python import numpy as np import xarray as xr

data = np.array([True, False, True, False]) test = xr.DataArray(data, coords=dict(x=np.arange(4)))

assert np.sum(test) == 2 assert test.sum(dim="x") == 2

assert np.sum(~test) == 2 (~test).sum(dim="x") == 2 tmp = ~test assert tmp.sum(dim="x") == 2 assert ~test.sum(dim="x") == 2, f"not 2: {~test.sum(dim='x').data}" # returns -3 ```

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.
  • [X] Recent environment — the issue occurs with the latest version of xarray and its dependencies.

Relevant log output

```Python AssertionError Traceback (most recent call last) File example.py:14 12 tmp = ~test 13 assert tmp.sum(dim="x") == 2 ---> 14 assert ~test.sum(dim="x") == 2, f"not 2: {~test.sum(dim='x').data}" # returns -3

AssertionError: not 2: -3 ```

Anything else we need to know?

No response

Environment

INSTALLED VERSIONS ------------------ commit: None python: 3.12.1 | packaged by conda-forge | (main, Dec 23 2023, 08:01:35) [Clang 16.0.6 ] python-bits: 64 OS: Darwin OS-release: 23.2.0 machine: arm64 processor: arm byteorder: little LC_ALL: None LANG: en_US.UTF-8 LOCALE: ('en_US', 'UTF-8') libhdf5: None libnetcdf: None xarray: 2024.1.1 pandas: 2.2.0 numpy: 1.26.3 scipy: None netCDF4: None pydap: None h5netcdf: None h5py: None Nio: None zarr: None cftime: None nc_time_axis: None iris: None bottleneck: None dask: None distributed: None matplotlib: None cartopy: None seaborn: None numbagg: None fsspec: None cupy: None pint: None sparse: None flox: None numpy_groupies: None setuptools: 69.0.3 pip: 23.3.2 conda: None pytest: None mypy: None IPython: 8.20.0 sphinx: None 
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   completed 13221727 issue

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