How can I sort a matrix elementwise ?

2019 10 21
2 个回答
回答已采纳
更新时间：2019 10 21
5 次查看（30 天）

1 个投票

Hi, I need to sort a matrix elementwise and get the results to a single vector without losing the index of each element.
For example,
A = [3, 4 ; 6, 2]
The sorted vector should be ,
B = [2;3;4;6]
without losing the information of each and every element in the original matrix.
Thank you.

请先登录，再回答此问题。

 采纳的回答

Andrei Bobrov
Andrei Bobrov 2019-10-21

1 个投票

A = [3, 4 ; 6, 2];
[m,~] = size(A);
[B,i] = sort(A(:));
index = [mod(i-1,m) + 1, ceil(i/m)];

更多回答（1 个）

Stephan
Stephan 2019-10-21

1 个投票

B = sort(reshape(A,[],1))

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Gayan Lankeshwara
Gayan Lankeshwara 2019-10-21
Hi Stephan,
Thank you for your answer.
But I actually need is something like this.
A = [3, 4 ; 6, 2]
The sorted vector should be ,
B = [2;3;4;6]
without losing the information of each and every element in the original matrix.
After I sorted the matrix and put the elements in a vector, I need to find the original index for each and every element in the sorted vector.
For example, in B=[2;3;4;6]
I need to tell element 6 is the A(2,1) element.
Actually this is kind of sorting with preserving the index.
If I just sort it, I cannot backtrack the original index of the each and every element.
Thanks.
Stephan
Stephan 2019-10-21
[B, idx] = sort(reshape(A,[],1))
[row,col] = ind2sub([size(A,1), size(A,2)],idx)
Gayan Lankeshwara
Gayan Lankeshwara 2019-10-21
Hi Stephan,
This is really what I needed and the inbuilt in2sub function is more powerful I guess.
Thanks.

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Shifting and Sorting Matrices 的更多信息

产品

版本

R2019b

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by