reordering matrix elements according to another matrix

26 views (last 30 days)
Hi,
If I have the following two matrices:
A = [2 ; 4 ; 1 ; 3];
B = [12; 15; 20; 9];
where each row in B corresponds to each row in A. If I sort the rows in A in an ascending order as:
A = sortrows(A); %matrix A here looks like this now A = [1 ; 2; 3; 4];
How can I reorder matrix B so that each of its rows corresponds to the reordered matrix A. In other words, how can I get the follwoing:
B = [20; 12; 9; 15];
Thanks.

Accepted Answer

Torsten
Torsten on 4 Apr 2022
[A,index] = sortrows(A)
B = B(index,:)

More Answers (1)

Stephen23
Stephen23 on 4 Apr 2022
Edited: Stephen23 on 4 Apr 2022
A = [2 ; 4 ; 1 ; 3];
B = [12; 15; 20; 9];
[A,X] = sort(A); % or SORTROWS
B = B(X)
B = 4×1
20 12 9 15

Categories

Find more on Matrices and Arrays in Help Center and File Exchange

Community Treasure Hunt

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

Start Hunting!