issues: 163414759
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| 163414759 | MDU6SXNzdWUxNjM0MTQ3NTk= | 894 | Dataset variable reference fails after renaming | 17951292 | closed | 0 | 4 | 2016-07-01T15:04:15Z | 2016-08-02T17:39:11Z | 2016-08-02T17:39:11Z | NONE | Using xarray v0.7.2, I've encountered what looks to be a bug whereby referencing a re-named variable raises a KeyError: compute anomaliesclimo = ds.groupby('time.dayofyear').mean('time') anom = ds.groupby('time.dayofyear') - climo anom.rename({'air': 't2manom'}) # Output <xarray.Dataset> Dimensions: (lat: 37, level: 1, lon: 192, time: 13514) Coordinates: - lat (lat) float32 88.542 86.6531 84.7532 82.8508 80.9473 79.0435 ... - level (level) float32 2.0 - lon (lon) float32 0.0 1.875 3.75 5.625 7.5 9.375 11.25 13.125 ... dayofyear (time) int32 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ... - time (time) datetime64[ns] 1979-01-01 1979-01-02 1979-01-03 ... Data variables: t2manom (time, level, lat, lon) float64 -6.342 -6.476 -6.522 -6.579 ... anom['t2manom'].values[0:5] Output: _--------------------------------------------------------------------------- KeyError Traceback (most recent call last) <ipython-input-10-05206d711de3> in <module>() 8 #del normalized['dayofyear'] 9 #normalized ---> 10 anom['t2manom'].values[0:5] /usr/local/lib/python2.7/dist-packages/xarray/core/dataset.pyc in getitem(self, key) 527 528 if hashable(key): --> 529 return self._construct_dataarray(key) 530 else: 531 return self._copy_listed(np.asarray(key)) /usr/local/lib/python2.7/dist-packages/xarray/core/dataset.pyc in construct_dataarray(self, name) 476 variable = self._variables[name] 477 except KeyError: --> 478 , name, variable = _get_virtual_variable(self._variables, name) 479 480 coords = OrderedDict() /usr/local/lib/python2.7/dist-packages/xarray/core/dataset.pyc in _get_virtual_variable(variables, key) 43 split_key = key.split('.', 1) 44 if len(split_key) != 2: ---> 45 raise KeyError(key) 46 47 ref_name, var_name = split_key KeyError: 't2manom'_ However, referencing the OLD variable name ('air' in this case) produces the output expected when referencing the NEW variable name: anom['air'].values[0:5] Output: array([[[[ -6.34243229, -6.47621607, -6.52189175, ..., -6.3105404 , -6.33972959, -6.30999986], [ -9.18891871, -9.32432412, -9.57216195, ..., -8.67081062, -8.89675656, -9.09081061], [ -8.8072971 , -9.27054033, -9.69972951, ..., -7.53378362, -7.93783766, -8.3737836 ], ..., [ -4.30864855, -3.5656756 , -1.10594592, ..., -1.70405402, -2.53135129, -2.92999993], [ -1.197027 , -1.34837835, -0.5481081 , ..., 0.01810811, 0.01540541, -0.62756755], [ 0.47135134, 0.22297297, -0.50756756, ..., 0.63297296, 0.65837836, 0.58891891]]], [...omitted values...] Am I doing something wrong here? |
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completed | 13221727 | issue |