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Sorting matrix with specifications for the order

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Jean
Jean 2012-11-19
Hi,
I have a certain matrix with n rows and 3 columns. I want to sort it according to the sums of the squares of its columns.
For example, let's say my matrix is
0 0 1
0 0 2
1 1 1
Since for the second row we have: 0^2+0^2+2^2 = 4, which is larger than the 3rd row: 1^2+1^2+1^2 = 3. In such a case, I want my matrix to look like:
0 0 1
1 1 1
0 0 2
Thank you for your help, it is very appreciated !

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-11-19
A=[0 0 1;0 0 2;1 1 1];
[~,idx]=sort(sum(A.^2,2))
out=A(idx,:)
  1 个评论
Jan
Jan 2012-11-19
This is faster than the arrayfun approach, but of course this matters for larger matrices only.

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Yowh
Yowh 2012-11-19
Here .. I think this will work ..
A = [0 0 1;0 0 2;1 1 1;0 0 0];
ans = sortrows(A, [3 2 1])

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