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Sort rows or cells (descending first column) where second column has repeated value

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Mauricio Escobar
Mauricio Escobar 2013-3-5
I have a set of points (x, y) in a matrix and want to re-arrange them according to a criteria.
Original : x ----- y (dots showing rows to arrange)
162, 59
161, 60
. 159, 61
. 160, 61
158, 62
157, 63
. 155, 64
. 156, 64
. 157, 64
. 153, 65
. 154, 65
152, 66
I need to sort them by row (descending within column 1, x) where my column 2 (y) has a repeated value.
Arranged: x ----- y
162, 59
161, 60
. 160, 61
. 159, 61
158, 62
157, 63
. 157, 64
. 156, 64
. 155, 64
. 154, 65
. 153, 65
152, 66
Since column 2 always has the same value within the criteria, I should sort only the column 1 (always within the criteria, of course).
Preferably without using loops. I am looking for the correct MATLAB way of doing it.

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-3-5
编辑：Azzi Abdelmalek 2013-3-5
Use sortrows
B=flipud(sortrows(A,1))
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Mauricio Escobar
Mauricio Escobar 2013-3-5
编辑：Mauricio Escobar 2013-3-5
Sorry! I am obviously not thinking straight. Since it will be the same thing as in my original.

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