从python中2D列表的所有元素中减去一个值 [英] Subtracting a value from all elements of a 2D list in python

问题描述

我有一个2D列表，我想从2D列表的所有元素中减去一个浮点值:

I have a 2D list and I want to subtract a floating point value from all the elements of the 2D list:

mat = [[1, 2], [3, 4]]
cons = 13
mat1 = cons - mat

但是最后一行不起作用.如何在python的2D列表中执行此操作?

But the last line doesn't work. How to do this in a 2D list in python?

谢谢.

推荐答案

如果您做很多这样的事情，请考虑使用numpy:

If you do a lot of such things, consider using numpy:

In [1]: import numpy as np

In [2]: mat = np.array([[1, 2], [3, 4]])

In [3]: cons = 13

In [4]: cons-mat
Out[4]: 
array([[12, 11],
       [10,  9]])

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