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

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.

Answer 1

[Azzi Abdelmalek]

Use sortrows

    B=flipud(sortrows(A,1))

[Azzi Abdelmalek]

%or

    B=sortrows(A,-1)

[Mauricio Escobar]

Thanks a lot! If I want to flip "down"?

[Mauricio Escobar]

The second option actually works better, since the first option changes some column 2 order at the beginning and end.

[Azzi Abdelmalek]

What do you mean by flip down?

[Azzi Abdelmalek]

I did not understand your question

[Mauricio Escobar]

Sorry! I am obviously not thinking straight. Since it will be the same thing as in my original.