Find all unique values and replace it with new values
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Elysi Cochin
on 6 Jun 2022
Commented: Image Analyst
on 7 Jun 2022
I have a vector with values
v = [0.23; 0.1; 0.33; 0.23 ; 0.33; 0.6; 0.6; 0.4];
I would like to find the unique values and replace the vector with numbers from 1, like
newV = [1; 2; 3; 1 ; 3; 4; 4; 5];
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Accepted Answer
Walter Roberson
on 6 Jun 2022
findgroups()
But since you are using floating point numbers you really should use the third output of uniquetol() instead
4 Comments
Image Analyst
on 7 Jun 2022
@Elysi Cochin I'm pretty sure you've seen the FAQ on this before but here it is again:
More Answers (2)
KSSV
on 6 Jun 2022
v = [0.23; 0.1; 0.33; 0.23 ; 0.33; 0.6; 0.6; 0.4];
[c,ia,newV] = unique(v,'stable') ;
newV
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Image Analyst
on 6 Jun 2022
Will this do:
v = [0.23; 0.1; 0.33; 0.23 ; 0.33; 0.6; 0.6; 0.4];
% newV = [1; 2; 3; 1 ; 3; 4; 4; 5];
[g, Tid] = findgroups(v)
I know it doesn't match your desired but it's easy and maybe you don't need that exact order. If you need that exact order, can you explain why you need that order? (And don't jsut say I need it because I need it.)
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