# what function to use to find frequency of values in set?

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BigWaffle on 23 Mar 2021
Answered: Image Analyst on 23 Mar 2021
How do I find number of occurence of a certain number in a set.
I have
R12= [5 6 1 2 6 1 2 1 2 6 5 2]
I need to find frequency of occurs of each number

Star Strider on 23 Mar 2021
Try this:
R12= [5 6 1 2 6 1 2 1 2 6 5 2];
[R12u,~,ix] = unique(R12(:),'stable');
Number = R12u;
Count = accumarray(ix,1);
Result = table(Number, Count)
producing:
Result =
4×2 table
Number Count
______ _____
5 2
6 3
1 3
2 4
.
##### 2 CommentsShowHide 1 older comment
Star Strider on 23 Mar 2021
My pleasure!

William on 23 Mar 2021
... or maybe histcounts(R12) to get a histogram.

Image Analyst on 23 Mar 2021
You could use histcounts:
R12= [5 6 1 2 6 1 2 1 2 6 5 2];
edges = [unique(R12), inf]
counts = histcounts(R12, edges)

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