python中的点积
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dot product in python
提问by user458858
Does this Python code actually find the dot product of two vectors?
这段 Python 代码真的能找到两个向量的点积吗？
import operator
vector1 = (2,3,5)
vector2 = (3,4,6)
dotProduct = reduce( operator.add, map( operator.mul, vector1, vector2))
采纳答案by whatnick
You can also use the numpy implementation of dot productwhich has large array optimizations in native code to make computations slightly faster. Even better unless you are specifically trying to write a dot product routine or avoid dependencies, using a tried tested widely used library is much better than rolling your own.
您还可以使用点积的 numpy 实现，它在本机代码中进行了大型数组优化，使计算速度稍微快一些。更好的是，除非您专门尝试编写点积例程或避免依赖项，否则使用久经考验的广泛使用的库比滚动自己的库要好得多。
回答by John La Rooy
Yes it does. Here is another way
是的，它确实。这是另一种方式
>>> sum(map( operator.mul, vector1, vector2))
48
and another that doesn't use operatorat all
而另一个不使用operator在所有
>>> vector1 = (2,3,5)
>>> vector2 = (3,4,6)
>>> sum(p*q for p,q in zip(vector1, vector2))
48
