从矩阵中获得具有最大总和值的列 [英] Get the column which have maximum sum value from matrix

问题描述

让我们说:

import numpy as np    
f=np.matrix("1 2; 3 4 ; 5 6")

是否可以从矩阵中检索最大列数之和的列数?怎么样?

Is retrieving number of column which have maximum sum of column from matrix possible? How?

推荐答案

您可以这样写:

>>> f.sum(axis=0).argmax()
1

因此，列1的总和为最大值.

So column 1 sums to the greatest value.

为说明其作用:f.sum(axis=0)对矩阵f的列求和，返回矩阵matrix([[ 9, 12]]).然后argmax()用于在此求和矩阵中找到最大值的索引.

To clarify what this does: f.sum(axis=0) sums the columns of the matrix f, returning the matrix matrix([[ 9, 12]]). Then argmax() is used to find the index of the maximum value in this matrix of sums.

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