例如,我有一个要在其中执行合并的数据框列:
df.head
X
4.6
2.5
3.1
1.7
我希望将一列用于bin范围,将一列用作标签,如下所示:
df.head
X bin label
4.6 (4,5] 5
2.5 (2,3] 3
3.1 (3,4] 4
1.7 (1,2] 2
显然,按如下所示设置label
参数只会在bin标签上产生一列,但在范围内不再显示。
df['bin'] = df.X.apply(pd.cut, labels=np.arange(5))
是否有更优雅的解决方案,而不是对两列都运行两次pd.cut
?
谢谢
如果允许pd.cut
动态设置bin边缘,则可以使用retbins
标志。从pd.cut
documentation:
pd.cut
这将返回第二个结果:
retbins: bool, default False
Whether to return the bins or not. Useful when bins is provided as a scalar.
您可以使用它来将垃圾箱边缘分配给框架:
bins: numpy.ndarray or IntervalIndex.
The computed or specified bins. Only returned when
retbins=True. For scalar or sequence bins, this is
an ndarray with the computed bins. If set
duplicates=drop, bins will drop non-unique bin. For
an IntervalIndex bins, this is equal to bins.
您的评论表示您希望在groupby操作中使用此功能。在这种情况下,您可以将以上内容包装在一个函数中:
assignments, edges = pd.cut(df.X, bins=5, labels=False, retbins=True)
df['label'] = assignments
df['bin_floor'] = edges[assignments]
df['bin_ceil'] = edges[assignments + 1]