reordering matrix elements according to another matrix

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Lama Hamadeh
Lama Hamadeh 2022-4-4
回答： Torsten 2022-4-4
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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采纳的回答

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

更多回答（1 个）

Stephen23
Stephen23 2022-4-4
编辑：Stephen23 2022-4-4
Ran in:
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

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