Sort cell array base on the 2D value

I have a 3X3 cell array and each element store a (x,y) point.

The point are generate by random number from [0,1].

What I want to do is sort the cell array so that it looks like following

ex: 9 points

each circle is one 2D point

index:(1,1) in the left top corner and (3,3) to the right bottom corner as the usual array index

that is to ensure the topological order.

How do I do it?

Thank in advance.

for the example

    pairs = [4 9 2 6 5 1 7 8 3; 9 6 2 1 3 8 7 4 5] (row 1 = x-values, row 2 = y-values))

what I want to do is put them in the cell array so that they can be connected by read lines like the image's topology.

[Cedric]

I up-vote this question; I don't have time now, but it is interesting.. not as simple as it looks.

[Cedric]

You built an example with 9 nodes, but how many do you have in reality?