sort two matrix

hi i have two matrix X,Y (same size) i want to sort X and the same time i want to take the matrix Y with the same changes as X

example:

X=[4,7,1,9] Y=[32,6,4,21]

after sort

X=[9,7,4,1] Y=[21,6,32,4]

thanks for your time!!!!

Answer 1

[Thomas]

[X,index]=sort(X,'descend')
Y=Y(index)

[george]

thanks, your speed is freaking me!!!

[Hugo Matias]

How do you do the same thing but without the descend part

i.e:

X=[4,7,1,9] Y=[32,6,4,21]

after:

X=[1,9,4,7] Y=[4,21,32,6]

[Steven Lord]

Neither your new X nor your new Y are sorted, so I assume you have a known vector of indices you used to reorder / "shuffle" one of those arrays. If so, use the same vector of indices to reorder the other array in the same way. In the example below, ind is the known vector of indices.

X = [4 7 1 9];
Y = [32, 6, 4, 21];

ind = [3 4 1 2];

X2 = X(ind)
Y2 = Y(ind)