How to ranking the values of one column in matrix and replace it without sorting of values of next column?

I have 4 points with x and y values: [4,7],[2,2],[10,2],[6,1].

And I put all points in one matrix A, where the first column represents x values, the second column shows y values of 4 points.

A =

     4     7
     2     2
    10     2
     6     1

I need to rank x values by putting in first row the lowest x=2, the second row x=4 and so on. But I don't

need to sort the second column (y values should be replaced with x values):

I need a result as shown below in matrix A:

A =

     2     2

     4     7

     6     1

    10     2

So, the lowest x values represents the first point,

For clearance:

1 point=[2,2]

2 point=[4,7]

3 point=[6,1]

4 point=[10,2]

Could anyone help me?

Answer 1

[Azzi Abdelmalek]

A =[ 4     7
   2     2
  10     2
  6     1]
B=sortrows(A)