reordering matrix elements according to another matrix

Question

0 个投票

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.

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Answer 1

Torsten 2022-4-4

0 个投票

[A,index] = sortrows(A)
B = B(index,:)

Answer 2

Stephen23 2022-4-4

编辑：Stephen23 2022-4-4

1 个投票

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