compare a group of data

I want to compare a group of data, try to delete the same element, and then output the data unique. For example, I have many groups of data, like u(:,1),u(:,2),u(:,3)... I only compare the first number of every group, if the numbers are equal, I output the whole group of numbers. First of all, I want to use 'unique', but it seems not what I want,any idea? thanks in advance u(:,1)=[1 2 3 6 8],u(:,2)=[8 9 6 5 3 ],u(:,3)=[1 2 3 6 8], u(:,4)=[ 4 5 6 9 8], u(:,5)=[7 6 4 7 3]... Through comparing the first number of every group, I delete u(:,1) or u(:,3) and then output the other three group.

[Sean de Wolski]

Please provide a small example of inputs/operation/output

Answer 1

[Sean de Wolski]

unique(u.','rows').';

transpose and use the rows option, then retranspose

If you don't want it sorted:

[~,idx] = unique(u','rows');
u(:,idx)

[zhiping]

thanks a lot!