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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
1331985070 I_kwDOAMm_X85PZHqu 6891 Passing extra keyword arguments to `curvefit` throws an exception. zoj613 44142765 open 0     13 2022-08-08T14:47:56Z 2023-03-26T19:40:43Z   NONE      

What happened?

Just like the title says, passing an extra keyword argument corresponding to scipy's curve_fit throws an exception. The documentation has a parameter section that says: *kwargs (optional) – Additional keyword arguments to passed to scipy curve_fit

So if one specifies a method="trf" keyword argument to the .curvefit method, you get an error: TypeError: curvefit() got an unexpected keyword argument 'method'

The only way it works as expected is if I pass the keyword arguments as dictionary elements via a kwargs argument like so: kwargs={"method": "trf"}. This behaviour contradicts what is mentioned in the docstring.

What did you expect to happen?

No error thrown

Minimal Complete Verifiable Example

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

da = xr.DataArray(

np.random.rand(4, 3),

[

    ("time", pd.date_range("2000-01-01", periods=4)),

    ("space", ["IA", "IL", "IN"]),

],

) da.curvefit(coords=["time"], func=lambda x, params: x, method="trf") ```

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.

Relevant log output

Python TypeError: curvefit() got an unexpected keyword argument 'method'

Anything else we need to know?

No response

Environment

```shell commit: None python: 3.8.12 | packaged by conda-forge | (default, Jan 30 2022, 23:42:07) [GCC 9.4.0] python-bits: 64 OS: Linux OS-release: 5.4.0-1061-aws machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: C.UTF-8 LOCALE: ('en_US', 'UTF-8') libhdf5: 1.12.1 libnetcdf: 4.8.1 xarray: 2022.3.0 pandas: 1.4.3 numpy: 1.22.0 scipy: 1.6.2 netCDF4: 1.6.0 pydap: None h5netcdf: 0.15.0 h5py: 3.7.0 Nio: None zarr: 2.10.3 cftime: 1.6.1 nc_time_axis: None PseudoNetCDF: None rasterio: None cfgrib: 0.9.10.1 iris: None bottleneck: None dask: 2022.03.0 distributed: 2022.3.0 matplotlib: None cartopy: None seaborn: None numbagg: None fsspec: 2022.01.0 cupy: None pint: None sparse: 0.13.0 setuptools: 63.1.0 pip: 22.2.2 conda: None pytest: 6.2.5 IPython: 8.4.0 sphinx: None ``` 
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     xarray 13221727 issue

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