Sort a matrix according to ordering in another matrix

I am trying to sort an array based on another array. I tried the sort method with index return, but it is somehow behaving strangely.

y = [1 2 3; 2 3 4] x = [1 3 4; 2 2 3] [yy, ii] = sort(y,'descend');

yy = 2 3 4 1 2 3 ii = 2 2 2 1 1 1

But my x(ii) is not the matrix sorted based on y.

x(ii)

y

x(ii) = 2 2 2 1 1 1

I am expecting the matrix to be:

x(ii) = 2 2 3 1 3 4

How can I sort the matrix x according to another matrix y?

x

y

Possible duplicate of Sort a matrix with another matrix

– Wolfie
Sep 17 '18 at 8:03

1 Answer
1

ii are row subscripts but are being inputted by you as linear indices.
You need to convert them to relevant linear indices before proceeding i.e.

ii

>> szx = size(x); >> x(sub2ind(szx, ii, repmat(1:szx(2),szx(1),1))) ans = 2 2 3 1 3 4

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