Matlab-排序矩阵 [英] Matlab - sorting a matrix

问题描述

我想我可以用一个例子来最好地说明这一点: 假设我有A = [1，4，2，3; 0，-1，2，-1]

I think I can illustrate this best with an example: Suppose I have A = [ 1, 4, 2, 3; 0,-1, 2, -1]

我想把它变成 [1、2、3、4； 0、2，-1，-1]

I want to turn it into [1, 2, 3, 4; 0, 2, -1, -1]

即保持列完整，并按第一行中的条目排序.我该怎么办?

i.e. keep columns intact, sort by entries in first row. How do I do this?

推荐答案

sortrows 命令可以满足您的要求:

The sortrows command does what you want:

>> A = [ 1, 4, 2, 3; 0,-1, 2, -1];
>> sortrows(A.').'   

ans =

     1     2     3     4
     0     2    -1    -1

您还可以使用sort中的第二个返回值来获取将矩阵转换为所需矩阵所必需的列置换:

You can also use the second return value from sort to get the column permutation necessary to turn your matrix into the one you want:

>> [~,ii] = sort(A(1,:))

ii =

     1     3     4     2

>> A(:,ii)

ans =

     1     2     3     4
     0     2    -1    -1

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