How do i create a table with increments of occurrences of a value based on another column?

I have a vector as: [1,2,3,4,5,1,3,4,6,5,1,3]

How do i create another vector as: [1,1,1,1,1,2,2,2,1,2,3,3]

Since 1 is repeating 3 times so i replaced the 1st occurance of 1 by 1, second occurence by 2 and third occurence by 3. Similarly, i did for others.

Answer 1

[David Hill]

x= [1,2,3,4,5,1,3,4,6,5,1,3];
y=unique(x);
z=ones(size(x));
for k=y
 a=find(x==k);
 z(a)=1:length(a);
end

[Shambhavi Adhikari]

What is k in here?

[David Hill]

k just goes through the y array ([1 2 3 4 5 6]), taking on each value one at a time.