MATLAB: How to remove repeating rows without unique function

Question

I have a 624×2 matrix of ordered pairs, of which there are some repeating rows that I must remove. Is there a way to remove these repeating rows without using the unique function? Maybe using a for loop? The reason I can't use the unique function is because when I implement this matlab script in Simulink's Matlab Function block, the matrix must be sorted first before using the unique function. I can't sort the matrix because I will lose my ordered pairs and sortrows doesn't solve the issue either because I get the same error from Simulink.

Answer 1

Use the 'stable' option:

 >> A = randi( 3, 10, 2 )
 A =
     2     3
     1     1
     3     1
     3     1
     3     1
     3     3
     3     3
     2     1
     2     3
     1     1
 >> unique( A, 'rows' )
 ans =
     1     1
     2     1
     2     3
     3     1
     3     3
 >> unique( A, 'rows', 'stable' )
 ans =
     2     3
     1     1
     3     1
     3     3
     2     1