relabel the elements in each column according to the magnitude of these elements in an array

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Grace 2014-6-5

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评论： Star Strider 2014-6-7

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Hi, I have

 a=[4 5; 
1;
4; 
7]

I want to relabel the elements in each column according to the magnitude of these elements in the column to become

   a=[1 3; 
1;
2; 
4]

How can I do this? Thank you.

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Star Strider 2014-6-5

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编辑：Star Strider 2014-6-5

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This works:

a=[4 5; 5 1;6 4; 7 7]
[as,ai] = sort(a,1);
b = [ai(ai(:,1),1)  ai(ai(:,2),2)]

produces:

It sorts the first and second columns independently. Then, to get the column indices as you want them, it maps each set of column indices to its own sorted indices. A bit complicated to explain, but taking the reference to the columns of b apart and looking at its components will reveal how it works.

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Grace 2014-6-7

Really thanks a lot, Star :) This helps me a lot!! Thanks again!!

Star Strider 2014-6-7

My pleasure!

It’s an unusual enough request that it took some time to come up with solution. When I was Answering another Question involving unique, it occurred to me that the unique function actually does exactly what you want.

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