当我将xr.ones_like
的结果分配给数据集变量时,我丢失了分配给坐标的一些数据:
import xarray as xr
import numpy as np
A, B, C = 2, 3, 4
ds = xr.Dataset()
ds.coords['source'] = (['a', 'b', 'c'], np.random.random((A, B, C)))
ds.coords['unrelated'] = (['a', 'c'], np.random.random((A, C)))
print('INITIAL:', ds['unrelated'], '\n')
# do 'ones_like' manually
ds['dest-1'] = (['a', 'b'], np.ones((A, B)))
print('AFTER dest-1:', ds['unrelated'], '\n')
ds['dest-2'] = xr.ones_like(ds['source'].isel(c=0))
print('AFTER dest-2:', ds['unrelated'], '\n')
输出:
INITIAL: <xarray.DataArray 'unrelated' (a: 2, c: 4)>
array([[0.185851, 0.962589, 0.772985, 0.570292],
[0.905792, 0.865125, 0.412361, 0.666977]])
Coordinates:
unrelated (a, c) float64 0.1859 0.9626 0.773 0.5703 0.9058 0.8651 ...
Dimensions without coordinates: a, c
AFTER dest-1: <xarray.DataArray 'unrelated' (a: 2, c: 4)>
array([[0.185851, 0.962589, 0.772985, 0.570292],
[0.905792, 0.865125, 0.412361, 0.666977]])
Coordinates:
unrelated (a, c) float64 0.1859 0.9626 0.773 0.5703 0.9058 0.8651 ...
Dimensions without coordinates: a, c
AFTER dest-2: <xarray.DataArray 'unrelated' (a: 2)>
array([0.185851, 0.905792])
Coordinates:
unrelated (a) float64 0.1859 0.9058
Dimensions without coordinates: a
为什么在使用xr.ones_like
后unrelated
会丢失维度
简而言之,这种行为看起来像a bug。如果没有某种明确的选择,分配变量肯定不应该修改现有坐标
这似乎是由于
xr.ones_like(ds['source'].isel(c=0))
具有不同的坐标值'unrelated'
,该坐标值(错误地)覆盖了现有坐标。因此,作为一种解决方法,您可以在将这个额外的坐标分配给ds['dest-2']
之前删除它,例如,使用或
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