issue_comments: 1124863541

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]')