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How to combine two matrices to one and sort the rows?

Asked by C Zeng

C Zeng (view profile)

on 5 Jun 2012

Hello, my question is given a matrix M, say 10*5 size and one 10*1 say n. I want to make a new matrix that combine those into one matrix say M_new(10*6 size), the first five columns come from M, and 6th column comes from n.

Afterwards, sort the rows from largest to smallest by the last entry, say the number in n. Is there a good code on this? Thanks.

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C Zeng

C Zeng (view profile)

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1 Answer

Answer by Oleg Komarov

Oleg Komarov (view profile)

on 5 Jun 2012
Accepted answer
M_new = [M, n];
M_new = sortrows(M_new,6);

See sortrows() for details.

5 Comments

C Zeng

C Zeng (view profile)

on 5 Jun 2012

Thanks, or M_new = sortrows(M_new,-6), right? :-)

Oleg Komarov

Oleg Komarov (view profile)

on 5 Jun 2012

Yes, I always forget about the minus!!

C Zeng

C Zeng (view profile)

on 6 Jun 2012

Haha, I just found it.

Oleg Komarov

Oleg Komarov (view profile)

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