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  • Provide a "shrink" command to remove bounding nan/ whitespace of DataArray · 4 ✖

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653752196 https://github.com/pydata/xarray/issues/4197#issuecomment-653752196 https://api.github.com/repos/pydata/xarray/issues/4197 MDEyOklzc3VlQ29tbWVudDY1Mzc1MjE5Ng== fujiisoup 6815844 2020-07-04T11:05:49Z 2020-07-04T11:05:49Z MEMBER

@cwerner ```python In [40]: idx = (da.count('y').cumsum() != 0) * (da.count('y')[::-1].cumsum()[::- ...: 1] != 0)

In [42]: da.isel(x=idx)
Out[42]: <xarray.DataArray (x: 3, y: 4)> array([[nan, 0., 2., nan], [nan, nan, nan, nan], [nan, 2., 0., nan]]) Dimensions without coordinates: x, y ``` Maybe this works, but I have no cleaner solution.

 
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   Provide a "shrink" command to remove bounding nan/ whitespace of DataArray 650549352
653731489 https://github.com/pydata/xarray/issues/4197#issuecomment-653731489 https://api.github.com/repos/pydata/xarray/issues/4197 MDEyOklzc3VlQ29tbWVudDY1MzczMTQ4OQ== shoyer 1217238 2020-07-04T07:04:51Z 2020-07-04T07:04:51Z MEMBER

Another way to write this currently would be with where: array.where(array.notnull(), drop=True)

 
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   Provide a "shrink" command to remove bounding nan/ whitespace of DataArray 650549352
653729887 https://github.com/pydata/xarray/issues/4197#issuecomment-653729887 https://api.github.com/repos/pydata/xarray/issues/4197 MDEyOklzc3VlQ29tbWVudDY1MzcyOTg4Nw== fujiisoup 6815844 2020-07-04T06:47:04Z 2020-07-04T06:47:04Z MEMBER

@keewis I think it is close to da.dropna(how='all') python In [12]: da.dropna('x', how='all').dropna('y', how='all') Out[12]: <xarray.DataArray (x: 2, y: 2)> array([[0., 2.], [2., 0.]]) Dimensions without coordinates: x, y I think supporting multiple dimensions for dropna is totally in our scope. Currently, dropna only works with a single dimension and da.dropna(how='all') does not work.

@cwerner Is it close to your example? If you don't want to drop all nans but only those located at the edges, the above example does not work.

 
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   Provide a "shrink" command to remove bounding nan/ whitespace of DataArray 650549352
653578137 https://github.com/pydata/xarray/issues/4197#issuecomment-653578137 https://api.github.com/repos/pydata/xarray/issues/4197 MDEyOklzc3VlQ29tbWVudDY1MzU3ODEzNw== keewis 14808389 2020-07-03T14:38:57Z 2020-07-03T14:41:16Z MEMBER

you should be able to emulate that using: ```python In [2]: data = np.array([ ...: [np.nan, np.nan, np.nan, np.nan], ...: [np.nan, 0, 2, np.nan], ...: [np.nan, 2, 0, np.nan], ...: [np.nan, np.nan, np.nan, np.nan], ...: ]) ...: da = xr.DataArray(data, dims=("x", "y"))

In [3]: def shrink(arr): ...: notnull = da.notnull() ...: indexers = { ...: dim: notnull.any(dim=set(da.dims) - set([dim])) ...: for dim in da.dims ...: } ...: return arr.sel(**indexers) ...:

In [4]: da Out[4]: <xarray.DataArray (x: 4, y: 4)> array([[nan, nan, nan, nan], [nan, 0., 2., nan], [nan, 2., 0., nan], [nan, nan, nan, nan]]) Dimensions without coordinates: x, y

In [5]: shrink(da) Out[5]: <xarray.DataArray (x: 2, y: 2)> array([[0., 2.], [2., 0.]]) Dimensions without coordinates: x, y ``` @pydata/xarray: is this common enough to add it to the API?

 
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   Provide a "shrink" command to remove bounding nan/ whitespace of DataArray 650549352

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