MATLAB: Eliminate a row where a column has repeated values

Question

Hi I have the following matrix

eliti =

Columns 1 through 8
         0         0    1.0000         0         0         0         0         0
         0         0    1.0000         0         0         0         0         0
         0    1.0000         0    1.0000    1.0000         0         0         0
Columns 9 through 16
         0         0         0         0         0    1.0000    1.0000         0
    1.0000    1.0000         0         0         0         0    1.0000         0
         0         0         0         0         0         0    1.0000         0
Columns 17 through 21
-24.0000   38.0000   10.0751    0.0413    0.2388
-52.0000   26.0000   11.1629    0.0458    0.6012
-24.0000   38.0000   10.0751    0.0413    0.3106

And I need to eliminate where there a repeated values in the 18th column so it will be like this eliti =

Columns 1 through 8
         0         0    1.0000         0         0         0         0         0
         0    1.0000         0    1.0000    1.0000         0         0         0
Columns 9 through 16
    1.0000    1.0000         0         0         0         0    1.0000         0
         0         0         0         0         0         0    1.0000         0
Columns 17 through 21
-24.0000   38.0000   10.0751    0.0413    0.2388
-52.0000   26.0000   11.1629    0.0458    0.6012

Answer 1

[~,b] = unique(eliti(:,18),'stable');
eliti_new = eliti(b,:);