finding only unique values

Suppose you have a column vector, the values are integers(in order) but some of them are repeated, e.g. it could be [1,1,1,1,2,3,3,4,5,5,5,5,5] I want to find the indices of unique values e.g. the index of 2 and 4 in the aforementioned example. the unique function in matlab returns on top of truly unique the first value of any nonunique value, so it would return the index of the first 1, the first 3 and first 5 but I don't want those

Answer 1

[the cyclist]

Maybe call these the "singleton" values. Here's one way:

x = [1,1,1,1,2,3,3,4,5,5,5,5,5];
unique_x = unique(x);

count_x = hist(x,unique_x);

singleton_x = unique_x(count_x==1)

[Bernard]

brilliant this saved me time thanks

Answer 2

[David Sanchez]

a=[1,1,1,1,2,3,3,4,5,5,5,5,5];
x = unique(a)
y = histc(a,x)==1;
lonely_values = find ( y == 1 )

or:

lonely_values = find ( (histc(a,unique(a))==1) == 1 )

lonely_values =

       2     4

Answer 3

[Azzi Abdelmalek]

[ii,jj]=sort(x);
out=sort(jj(strfind(logical([1 diff(ii) 1]),[true,true])))