I have 98x3 matrix with only 7 unique rows of values which are output of some simulation. How do I extract that? I tried Unique function but am not getting unique rows. Below is the original matrix A and matrix after using unique function B.

A
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
  1.0000   -1.0000    0.0500
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
  1.5000   -0.0000    0.0500
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
  1.0000    1.0000    0.0500
  1.0000    1.0000    0.0500
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
 -1.0000    1.0000    0.0500
 -1.0000    1.0000    0.0500
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
 -1.5000   -0.0000    0.0500
 -1.5000   -0.0000    0.0500
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
       0         0         0
 -1.0000   -1.0000    0.0500
 -1.0000   -1.0000    0.0500
B=unique(A,'rows')
B
-1.5000   -0.0000    0.0500
 -1.5000   -0.0000    0.0500
 -1.0000   -1.0000    0.0500
 -1.0000    1.0000    0.0500
       0         0         0
  1.0000   -1.0000    0.0500
  1.0000    1.0000    0.0500
  1.5000   -0.0000    0.0500

Answer 1

[Rik]

This is probably due to rounding errors caused by the way doubles are stored in computers. You can use uniquetol instead:

B=uniquetol(A,'ByRows',true);

The tolerance defaults to 1e-6 for single-precision inputs and 1e-12 for double-precision inputs. You can also specify your own tolerance instead.

[akash sonnad]

Thanks for the hint. Since i was'nt interested in accuracy of data so rounded it off till 3rd decimal digits. It helps !!