issues: 822320976

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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
822320976 MDU6SXNzdWU4MjIzMjA5NzY= 4995 KeyError when selecting "nearest" data with given tolerance 43613877 open 0     8 2021-03-04T17:00:13Z 2022-10-25T14:35:35Z   CONTRIBUTOR      

What happened: Selecting data with ds.sel(index=given_index, method="nearest", tolerance=tolerance) only works in case for each given_index exists an index that is within the given tolerance, otherwise a `KeyError: "not all values found in index 'index'" occurs.

What you expected to happen: I would expect, that those indices that are not within the tolerance would simply be dropped.

Minimal Complete Verifiable Example:

```python import xarray as xr ds = xr.DataArray([1,2,3,4,5], dims=["lat"], coords={'lat':[10,20,30,50,60]})

working example, all latitudes are within the tolerance

ds.sel(lat=[5,15,40], method="nearest", tolerance=10)

<xarray.DataArray (lat: 3)>

array([1, 2, 4])

Coordinates:

* lat (lat) int64 10 20 50

failing example, latitude 40 is not within the tolerance

ds.sel(lat=[5,15,40], method="nearest", tolerance=5)

KeyError: "not all values found in index 'lat'"

```

I would expect ```

ds.sel(lat=[5,15,40], method="nearest", tolerance=5) <xarray.DataArray (lat: 2)> array([1, 2]) Coordinates: * lat (lat) int64 10 20 ```

Anything else we need to know?:

Environment:

Output of <tt>xr.show_versions()</tt> INSTALLED VERSIONS ------------------ commit: 66acafa7f1f1477cfd6c5b7c3458859763433092 python: 3.8.8 | packaged by conda-forge | (default, Feb 20 2021, 16:12:38) [Clang 11.0.1 ] python-bits: 64 OS: Darwin OS-release: 20.2.0 machine: x86_64 processor: i386 byteorder: little LC_ALL: None LANG: None LOCALE: None.UTF-8 libhdf5: 1.10.6 libnetcdf: 4.7.4 xarray: 0.15.2.dev452+g66acafa7.d20210304 pandas: 1.2.3 numpy: 1.20.1 scipy: 1.6.0 netCDF4: 1.5.6 pydap: installed h5netcdf: 0.10.0 h5py: 3.1.0 Nio: None zarr: 2.6.1 cftime: 1.4.1 nc_time_axis: 1.2.0 PseudoNetCDF: installed rasterio: 1.2.0 cfgrib: 0.9.8.5 iris: 2.4.0 bottleneck: 1.3.2 dask: 2021.02.0 distributed: 2021.02.0 matplotlib: 3.3.4 cartopy: 0.18.0 seaborn: 0.11.1 numbagg: installed pint: 0.16.1 setuptools: 49.6.0.post20210108 pip: 20.2.4 conda: None pytest: 6.2.2 IPython: None sphinx: None 
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     13221727 issue

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