Transposed Matrix

Transposed Matrix

In linear algebra, the transpose of a matrix A is another matrix A^T (also written A′, A^tr,^tA or A^t) created by any one of the following equivalent actions:

• reflect A over its main diagonal (which runs from top-left to bottom-right) to obtain A^T
• write the rows of A as the columns of A^T
• write the columns of A as the rows of A^T

Formally, the i^th row, j^th column element of A^T is the j^th row, i^th column element of A:

[A^T]_{i j} = [A]_{j i}

If A is an m × n matrix then A^T is an n × m matrix.

You have been given a matrix as a 2D list with integers. Your task is to return a transposed matrix based on input.

Input: A matrix as a list of lists with integers.

Output: The transposed matrix as a list of lists with integers.

题目大义: 矩阵转置

 def checkio(data):
     rel = []
     tmp = zip(*data)

     for each in tmp:
         rel.append(list(each))

     #replace this for solution
     return rel

使用map函数一行解决

 def checkio(data):
     return map(list, zip(*data))

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