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Add multi-dimensional extrapolation example and mention different behavior of kwargs in interp #3956

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merged 3 commits into from
Apr 18, 2020
Merged

Add multi-dimensional extrapolation example and mention different behavior of kwargs in interp #3956

merged 3 commits into from
Apr 18, 2020

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matrss
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@matrss matrss commented Apr 8, 2020

This corrects an error in the documentation of using interp to extrapolate. Apparently the argument fill_value changed at some point and now uses None instead of 'extrapolate' to indicate that extrapolation should be done.

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dcherian commented Apr 8, 2020

Can you add a note explicitly mentioning that change in scipys API?

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matrss commented Apr 8, 2020

Ok, I should have looked into this some more, my bad. The problem here is that scipy's interp1d and interpn accept different values for fill_value, and I blindly assumed they would use the same. The option 'extrapolate' does work for interp1d, while interpn emits a ValueError in that case and needs None to extrapolate. On the other hand, interp1d with fill_value=None does not extrapolate.

Maybe a note on the kwargs parameter of interp mentioning that scipy's interpolation functions accept different arguments and a example of multi-dimensional extrapolation would be the way to go here?

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dcherian commented Apr 8, 2020

Sure

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Thanks @Risebell . It'd be nice to open a scipy issue asking them to make their API consistent.

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Also please add a note to whats-new taking credit for this contribution

@dcherian dcherian mentioned this pull request Apr 10, 2020
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@matrss matrss changed the title Fix documentation for extrapolation to reflect changes in scipy Add multi-dimensional extrapolation example and mention different behavior of kwargs in interp Apr 14, 2020
@matrss matrss mentioned this pull request Apr 14, 2020
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matrss commented Apr 14, 2020

Sorry for the delay. I added a note to whats-new and updated the title of the PR to reflect what's actually done with this. I also opened an issue with scipy over at scipy/scipy#11853.

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Thanks @Risebell

@dcherian dcherian merged commit 6a6f2c8 into pydata:master Apr 18, 2020
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Thanks @Risebell !

dcherian added a commit to dcherian/xarray that referenced this pull request May 1, 2020
@dcherian
Merge remote-tracking branch 'upstream/master' into map-blocks-schema
085ce9a 
* upstream/master: (39 commits)
  Pint support for DataArray (pydata#3643)
  Apply blackdoc to the documentation (pydata#4012)
  ensure Variable._repr_html_ works (pydata#3973)
  Fix handling of abbreviated units like msec (pydata#3998)
  full_like: error on non-scalar fill_value (pydata#3979)
  Fix some code quality and bug-risk issues (pydata#3999)
  DOC: add pandas.DataFrame.to_xarray (pydata#3994)
  Better chunking error messages for zarr backend (pydata#3983)
  Silence sphinx warnings (pydata#3990)
  Fix distributed tests on upstream-dev (pydata#3989)
  Add multi-dimensional extrapolation example and mention different behavior of kwargs in interp (pydata#3956)
  keep attrs in interpolate_na (pydata#3970)
  actually use preformatted text in the details summary (pydata#3978)
  facetgrid: Ensure that colormap params are only determined once. (pydata#3915)
  RasterioDeprecationWarning (pydata#3964)
  Empty line missing for DataArray.assign_coords doc (pydata#3963)
  New coords to existing dim (doc) (pydata#3958)
  implement a more threadsafe call to colorbar (pydata#3944)
  Fix wrong order of coordinate converted from pd.series with MultiIndex (pydata#3953)
  Updated list of core developers (pydata#3943)
  ...
dcherian added a commit to kmuehlbauer/xarray that referenced this pull request May 9, 2020
@dcherian
Merge remote-tracking branch 'upstream/master' into fix-idxminmax-das…
20ccf5a 
…k-issues

* upstream/master: (22 commits)
  support darkmode (pydata#4036)
  Use literal syntax instead of function calls to create the data structure (pydata#4038)
  Add template xarray object kwarg to map_blocks (pydata#3816)
  Transpose coords by default (pydata#3824)
  Remove broken test for Panel with to_pandas() (pydata#4028)
  Allow warning with cartopy in docs plotting build (pydata#4032)
  Support overriding existing variables in to_zarr() without appending (pydata#4029)
  chore: Remove unnecessary comprehension (pydata#4026)
  fix to_netcdf docstring typo (pydata#4021)
  Pint support for DataArray (pydata#3643)
  Apply blackdoc to the documentation (pydata#4012)
  ensure Variable._repr_html_ works (pydata#3973)
  Fix handling of abbreviated units like msec (pydata#3998)
  full_like: error on non-scalar fill_value (pydata#3979)
  Fix some code quality and bug-risk issues (pydata#3999)
  DOC: add pandas.DataFrame.to_xarray (pydata#3994)
  Better chunking error messages for zarr backend (pydata#3983)
  Silence sphinx warnings (pydata#3990)
  Fix distributed tests on upstream-dev (pydata#3989)
  Add multi-dimensional extrapolation example and mention different behavior of kwargs in interp (pydata#3956)
  ...
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@matrss @dcherian @max-sixty