How to make a unique vector

Hello. Given this vector:

a = [22 20 21 20 24 25 26 22]

I want it to return

[22 20 21 24 25 26]

The unique function works but, I don't want the array to increase in order. I'm new and thank you in advance.

Answer 1

[D]

Also, from stackoverflow (I don't remember where, but if I find the post, I'll link it):

[junk,index] = unique(a,'first');    % removes non-unique, saves order in "index"
a = a(sort(index));   % sorts according to index

EDIT: Credit goes to gnovice at stackoverflow: http://stackoverflow.com/questions/3065387/how-can-i-remove-duplicates-in-an-array-but-keep-the-same-order

Answer 2

[Oleg Komarov]

http://www.mathworks.com/matlabcentral/fileexchange/30854-unsorted-set-operations

Answer 3

[Paulo Silva]

a = [22 20 21 20 24 25 26 22] %your vector
b=unique(a); %get the unique ones
d=perms(b);  %get all possible permutations of the vector values
%sort the rows so we can avoid the first one 20 21 ... 
d=sortrows(d); %sort the rows
p=randi([2 size(d,1)]); %get a random row of the array
%you can also avoid the last one if you want by using the next line instead
%p=randi([2 size(d,1)-1]); 
v=d(p,:) %get all the values from the row selected

Answer 4

[Yingquan Li]

Hey guys, I tried: for i = 1:length(a) for j = 2:length(a) if (a(i) == a(j)) a(j) = [] end end end

There was an error. I don't see what's wrong.

[Sean de Wolski]

well you keep making a smaller by removing elements but the for-loop wants to go to it's original length.