从矩阵中提取列 [英] extracting column from matrix

问题描述

好的，我只是想知道如何从矩阵中提取列.这将使用功能中定义的用户.

Alright so I was just wondering how I would extract a column from a matrix. This would be using a user defined in function.

例如:

D = [[2,9], [5,2], [1,0]]
def col(B,j):


print(col(D,0))

将导致:[2,5,1]

would result in: [2,5,1]

没关系自己弄清楚

def col(B,j):
    Z=[]
    for i in range(len(B)):
        Z.append(B[i][j])

    return Z

推荐答案

def col(B,j):
    Z=[]
    for i in range(len(B)):
        Z.append(B[i][j])
    return Z

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