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sort two matrix

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george
george 2012-5-31
评论： Steven Lord 2018-11-30
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!!!!

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采纳的回答

Thomas
Thomas 2012-5-31
[X,index]=sort(X,'descend')
Y=Y(index)
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Hugo Matias
Hugo Matias 2018-11-30
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
Steven Lord 2018-11-30
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)

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