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

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BigWaffle
BigWaffle 2021-3-23
回答： Image Analyst 2021-3-23
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

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采纳的回答

Star Strider
Star Strider 2021-3-23
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
.

更多回答（2 个）

William
William 2021-3-23
... or maybe histcounts(R12) to get a histogram.
Image Analyst
Image Analyst 2021-3-23
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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