[英]How to mask numpy structured array on multiple columns?
I have a numpy structured array with a dtype such as:我有一个 Dtype 的 numpy 结构化数组,例如:
A = numpy.empty(10, dtype=([('segment', '<i8'), ('material', '<i8'), ('rxN', '<i8')]))
I know I can create a mask such as:我知道我可以创建一个面具,例如:
A[A['segment'] == 42] = ...
Is there a way to create a mask on multiple columns?有没有办法在多列上创建掩码? For example (I know this doesn't work, but I wish it did):例如(我知道这不起作用,但我希望它起作用):
A[A['segment'] == 42 and A['material'] == 5] = ...
You can use the &
operator instead of and
:您可以使用&
运算符代替and
:
A[(A['segment'] == 42) & (A['material'] == 5)]
Note that extra parantheses are required.请注意,需要额外的括号。
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