Which is the shortest way to count elements in the set of vector components?

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Mr M.
Mr M. 2015-3-31
编辑： Stephen23 2015-3-31
v = [1,3,4,1,2,2,1,2,3,2,2,2,1,4]
I would like to count the twos.
I have this ugly solution:
length(v(v==2))
are there any shorter solution?

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采纳的回答

Titus Edelhofer
Titus Edelhofer 2015-3-31
Hi,
slightly less ugly:
sum(v==2)
Titus

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Stephen23
Stephen23 2015-3-31
编辑：Stephen23 2015-3-31
sum(v==2)
nnz(v==2)

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