# Recoding unique numbers to another number

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Cside on 28 Dec 2020
Answered: Walter Roberson on 28 Dec 2020
Hi I have this array of numbers [5 5 6 6 6 11 11 ]and would like to convert every unique number from 1 to n. For example, if there are 10 unique numbers, I would like to relabel them from 1 to 10, with the same number coded the same for eg [1 1 2 2 2 3 3]
The actual array is attached here. How may I code for this? Thanks so much!

Stephen23 on 28 Dec 2020
The simple and efficient MATLAB solution:
X = [5,5,6,6,6,11,11];
[~,~,Z] = unique(X,'stable')
Z = 7×1
1 1 2 2 2 3 3

### More Answers (2)

KALYAN ACHARJYA on 28 Dec 2020
Edited: KALYAN ACHARJYA on 28 Dec 2020
data=[5 5 6 6 6 11 11];
counts=histc(data,unique(data));
data_result=repelem(1:length(unique(data)),counts)
Results:
data_result =
1 1 2 2 2 3 3

Walter Roberson on 28 Dec 2020
findgroups(data)

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