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Ran 18 Dec 2017 05:44AM UTC

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Committed 18 Dec 2017 05:38AM UTC coverage: 72.392% (+0.06%) from 72.332%

Job # CONDA_ENV=py34

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Commit Message

Indexing Variable objects with a mask (#1751)

* Variable indexing with a mask

This will be useful for multi-dimensional reindexing: marking masked items with
-1 is exactly the convention used by pandas.Index.get_indexer().

Example usage:

    In [6]: variable = xr.Variable(('x',), [1, 2, 3])

    In [7]: variable._getitem_with_mask([0, 1, 2, -1])
    Out[7]:
    <xarray.Variable (x: 4)>
    array([  1.,   2.,   3.,  nan])

    In [8]: variable._getitem_with_mask(xr.Variable(('x', 'y'), [[0, -1], [-1, 1]]), fill_value=-99)
    Out[8]:
    <xarray.Variable (x: 2, y: 2)>
    array([[  1, -99],
           [-99,   2]])

This uses where() so it isn't the most efficient (there is some wasted effort
doing indexing, as noted in the TODOs), but the implementation is pretty clean
and already works with dask.

For now, I'm leaving this as private API, but let's expose it publicly in the
future if we are happy with it. I would probably leave it as a Variable method
since this is pretty low-level.

* More tests for _getitem_with_mask & fixes for dask

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