issue_comments: 488112182

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https://github.com/pydata/xarray/issues/1569#issuecomment-488112182 https://api.github.com/repos/pydata/xarray/issues/1569 488112182 MDEyOklzc3VlQ29tbWVudDQ4ODExMjE4Mg== 1559890 2019-04-30T20:55:01Z 2019-04-30T20:55:01Z NONE

I got a solution which is not so flexible but works: Data: python import pandas as pd arrays = [np.array(['bar', 'bar', 'baz', 'baz', 'foo', 'foo']), np.array(['one', 'two', 'one', 'two', 'one', 'two'])] da = pd.DataFrame(np.random.randn(6, 4)).to_xarray().to_array() da.coords['index'] = pd.MultiIndex.from_arrays(arrays, names=['first', 'second']) da <xarray.DataArray (variable: 4, index: 6)> array([[ 0.379189, 1.082292, -2.073478, -0.84626 , -1.529927, -0.837407], [-0.267983, -0.2516 , -1.016653, -0.085762, -0.058382, -0.667891], [-0.013488, -0.855332, -0.038072, -0.385211, -2.149742, -0.304361], [ 1.749561, -0.606031, 1.914146, 1.6292 , -0.515519, 1.996283]]) Coordinates: * index (index) MultiIndex - first (index) object 'bar' 'bar' 'baz' 'baz' 'foo' 'foo' - second (index) object 'one' 'two' 'one' 'two' 'one' 'two' * variable (variable) int32 0 1 2 3 Groupby on levels: ```python def multi_groupby(data, levels): return (((k0,k1),v1) for k0,v0 in data.groupby(levels[0]) for k1,v1 in v0.groupby(levels[1]))

for k,v in multi_groupby(da,['second','variable']): print(k,v) ('one', 0) <xarray.DataArray (index: 3)> array([ 0.379189, -2.073478, -1.529927]) Coordinates: * index (index) MultiIndex - first (index) object 'bar' 'baz' 'foo' - second (index) object 'one' 'one' 'one' variable int32 0 ('one', 1) <xarray.DataArray (index: 3)> array([-0.267983, -1.016653, -0.058382]) Coordinates: * index (index) MultiIndex - first (index) object 'bar' 'baz' 'foo' - second (index) object 'one' 'one' 'one' variable int32 1 ('one', 2) <xarray.DataArray (index: 3)> array([-0.013488, -0.038072, -2.149742]) Coordinates: * index (index) MultiIndex - first (index) object 'bar' 'baz' 'foo' - second (index) object 'one' 'one' 'one' variable int32 2 ('one', 3) <xarray.DataArray (index: 3)> array([ 1.749561, 1.914146, -0.515519]) Coordinates: * index (index) MultiIndex - first (index) object 'bar' 'baz' 'foo' - second (index) object 'one' 'one' 'one' variable int32 3 ('two', 0) <xarray.DataArray (index: 3)> array([ 1.082292, -0.84626 , -0.837407]) Coordinates: * index (index) MultiIndex - first (index) object 'bar' 'baz' 'foo' - second (index) object 'two' 'two' 'two' variable int32 0 ('two', 1) <xarray.DataArray (index: 3)> array([-0.2516 , -0.085762, -0.667891]) Coordinates: * index (index) MultiIndex - first (index) object 'bar' 'baz' 'foo' - second (index) object 'two' 'two' 'two' variable int32 1 ('two', 2) <xarray.DataArray (index: 3)> array([-0.855332, -0.385211, -0.304361]) Coordinates: * index (index) MultiIndex - first (index) object 'bar' 'baz' 'foo' - second (index) object 'two' 'two' 'two' variable int32 2 ('two', 3) <xarray.DataArray (index: 3)> array([-0.606031, 1.6292 , 1.996283]) Coordinates: * index (index) MultiIndex - first (index) object 'bar' 'baz' 'foo' - second (index) object 'two' 'two' 'two' variable int32 3 ```

 
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