MATLAB: How to sort one array based on the order of a second array

Question

Hi,

This seems like a very simple problem, but I can't seem to get it to work with the answers already available.

I have 2 string arrays:

A=["1a","1b","1c","1d","1e","2a","2b","2c","2d","2e"];
B=["A1_2a","U1_1c","Z1_2d","I1_1e","T1_1a","F1_2b","O1_1d","P1_2c","J1_2e","S1_1b"];

Let's say A is a newly sorted array from a previously disordered array (e.g. Q=["1c","2a","1e","2d","1b","2c","2e","1a","2b","1d"];)

How do I sort B, based on how Q was sorted?

The goal is to produce the array below

C=["T1_1a","S1_1b","U1_1c","O1_1d","I1_1e","A1_2a","F1_2b","P1_2c","Z1_2d","J1_2e"];

Thanks in advance.

Answer 1

As far as I can tell, the order of Q is irrelevant.

A = ["1a","1b","1c","1d","1e","2a","2b","2c","2d","2e"]; % sorted
B = ["A1_2a","U1_1c","Z1_2d","I1_1e","T1_1a","F1_2b","O1_1d","P1_2c","J1_2e","S1_1b"];
[~,X] = ismember(A,extractAfter(B,'_'));
C = B(X)
C = 1×10 string array
    "T1_1a"    "S1_1b"    "U1_1c"    "O1_1d"    "I1_1e"    "A1_2a"    "F1_2b"    "P1_2c"    "Z1_2d"    "J1_2e"