我正在尝试计算每个组中的成员数量,类似于pandas.DataFrame.groupby.count
. 但是,它似乎不起作用。这是一个例子:
In [1]: xr_test = xr.DataArray(np.random.rand(6), coords=[[10,10,11,12,12,12]], dims=['dim0'])
xr_test
Out[1]: <xarray.DataArray (dim0: 6)>
array([ 0.92908804, 0.15495709, 0.85304435, 0.24039265, 0.3755476 ,
0.29261274])
Coordinates:
* dim0 (dim0) int32 10 10 11 12 12 12
In [2]: xr_test.groupby('dim0').count()
Out[2]: <xarray.DataArray (dim0: 6)>
array([1, 1, 1, 1, 1, 1])
Coordinates:
* dim0 (dim0) int32 10 10 11 12 12 12
但是,我希望这个输出:
Out[2]: <xarray.DataArray (dim0: 3)>
array([2, 1, 3])
Coordinates:
* dim0 (dim0) int32 10 11 12
这是怎么回事?
换句话说:
In [3]: xr_test.to_series().groupby(level=0).count()
Out[3]: dim0
10 2
11 1
12 3
dtype: int64