How to sort a two column vector

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Jórdan Venâncio Leite
评论： Rena Berman 2020-10-12
I need to order this two column vector (attached) in such a way that the first column (x) is ordered ascending and the second column follows this order. In other words, it is very important to me that the values in the second column remain the same for each value of x.
Thanks in advance.
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Stephen23
Stephen23 2020-6-11
Original question by Jórdan Venâncio Leite on 2nd June 2020 retrieved from Google Cache (uploaded data could not be retrieved):
"How to sort a two column vector"
I need to order this two column vector (attached) in such a way that the first column (x) is ordered ascending and the second column follows this order. In other words, it is very important to me that the values in the second column remain the same for each value of x.
Thanks in advance.

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回答（2 个）

dpb
dpb 2020-6-2
s=sortrows(x);
KSSV
KSSV 2020-6-2
Let A be your vector of two columns.
[val,idx] = sort(A(:,1)) ; % sort the first column
iwant = A(idx,:) % arrange A in ascending order of first column

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