how to count the occurrences of a value for an matrix?

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Anusha
Anusha 2014-3-4
回答： Image Analyst 2014-3-4
a= [ 3 4 5; 7 8 9; 3 6 8 ; 4 6 9; 3 6 5]
I expected the ans:
b=
[ 3 3
4 2
5 2
7 1
8 2
9 2
6 3]
all the values must displays the number of occurences

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采纳的回答

lvn
lvn 2014-3-4
c=unique(a);
b=[c, sum(bsxfun(@eq,a(:),c'))']
b =
3 3
4 2
5 2
6 3
7 1
8 2
9 2

更多回答（1 个）

Image Analyst
Image Analyst 2014-3-4
What you're describing is the histogram. You can use the histc() function to get the counts, and then stitch the bins and counts together to get the "b" variable you want.
a = [ 3 4 5; 7 8 9; 3 6 8 ; 4 6 9; 3 6 5]
bins = unique(a);
counts = histc(a(:), bins);
b = [bins, counts]

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