MATLAB: How can i find the position of same elements in matlab……

MATLAB

For Example :
    x=[1 1 1 2 2 3 3 5 5 5 7 7 7]
result =
     1     1     3
     2     4     5
     3     6     7
     5     8    10
     7    11    13
Regards…….
 I try something like this, ('works')but is really slow 
    ind=unique(x)
    for i = 1 : length(ind);
    [z] =find(x==ind(i))
    limit(i,:)=[z(1) z(end)]
    end

Best Answer

[a,b1] = unique(x,'first');
[a,b2] = unique(x,'last');
result = [a(:),b1,b2];
or
ii = [find([true;diff(x(:))~=0]);numel(x)+1];
result=[x(ii(1:end-1))',ii(1:end-1),ii(2:end)-1];
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