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  • malmans2 · 1 ✖

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  • `polyval` with timedelta64 coordinates produces wrong results · 1 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1124863541 https://github.com/pydata/xarray/issues/6597#issuecomment-1124863541 https://api.github.com/repos/pydata/xarray/issues/6597 IC_kwDOAMm_X85DDA41 malmans2 22245117 2022-05-12T11:12:39Z 2022-05-12T11:12:39Z CONTRIBUTOR

Thanks - I think I might be misunderstanding how the new implementation works. I tried the following changes, but both of them return an error: python xr.polyval(values - values[0], polyfit_coefficients) Traceback (most recent call last): File "/Users/mattia/MyGit/test.py", line 31, in <module> xr.polyval(values - values[0], polyfit_coefficients) File "/Users/mattia/MyGit/xarray/xarray/core/computation.py", line 1908, in polyval coord = _ensure_numeric(coord) # type: ignore # https://github.com/python/mypy/issues/1533 ? File "/Users/mattia/MyGit/xarray/xarray/core/computation.py", line 1949, in _ensure_numeric return to_floatable(data) File "/Users/mattia/MyGit/xarray/xarray/core/computation.py", line 1939, in to_floatable x.data, ValueError: cannot include dtype 'm' in a buffer

python xr.polyval(azimuth_time.coords["azimuth_time"], polyfit_coefficients) Traceback (most recent call last): File "/Users/mattia/MyGit/test.py", line 31, in <module> xr.polyval(azimuth_time.coords["azimuth_time"], polyfit_coefficients) File "/Users/mattia/MyGit/xarray/xarray/core/computation.py", line 1908, in polyval coord = _ensure_numeric(coord) # type: ignore # https://github.com/python/mypy/issues/1533 ? File "/Users/mattia/MyGit/xarray/xarray/core/computation.py", line 1949, in _ensure_numeric return to_floatable(data) File "/Users/mattia/MyGit/xarray/xarray/core/computation.py", line 1938, in to_floatable data=datetime_to_numeric( File "/Users/mattia/MyGit/xarray/xarray/core/duck_array_ops.py", line 434, in datetime_to_numeric array = array - offset numpy.core._exceptions._UFuncBinaryResolutionError: ufunc 'subtract' cannot use operands with types dtype('<m8[ns]') and dtype('<M8[D]')

 
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   `polyval` with timedelta64 coordinates produces wrong results 1233717699

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