[英]Why does matrix multiplication in NumPy not call the __add__ method?
How does the method __mul__
in the class matrix
in NumPy work? NumPy中的class
matrix
中的方法__mul__
是如何工作的呢? I want to implement a binary matrix multiplication, and I have a class Binary
:我想实现二进制矩阵乘法,我有一个 class
Binary
:
class Binary(int):
def __init__(self, val):
if val != 0:
self.val = 1
else:
self.val = 0
def __add__(self, other):
print('add')
return self.val ^ other
def __radd__(self, other):
print('radd')
return self.val ^ other
My test:我的测试:
from Binary import Binary
from numpy import matrix
i = Binary(1)
o = Binary(0)
a = matrix([i, i, o, i, i, o, o], dtype=Binary)
b = matrix([[o, o, i],
[o, i, o],
[o, i, i],
[i, o, o],
[i, o, i],
[i, i, o],
[i, i, i]], dtype=Binary)
print(a * b)
Result:结果:
./test.py
[[2 1 2]]
The method __add__
is not used.不使用方法
__add__
。 Whereas there is a summation in matrix multiplication.而矩阵乘法中有求和。
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