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How can I count the occurrences of each element in a column vector and store them in a vector of the same dimension as the original one?

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MRC
MRC 2013-11-29
回答： dpb 2013-11-29
Hi, I have a vector A mx1 and I want to create a vector B mx1 reporting the number of occurrences of each element in A, e.g. if
A=[1;2;2;3;4;2;5;6;7;8;8];
then
B=[1;3;3;1;1;3;1;1;1;2;2];
I prefer not to use loops because actual vectors have very high dimensions.

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Roger Stafford
Roger Stafford 2013-11-29
[c,ix] = histc(A,unique(A));
B = c(ix);

更多回答（1 个）

dpb
dpb 2013-11-29
N=histc(A,unique(A));
B=N(A);

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