Counting certain values from an array

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Vadim Tambovtsev
Vadim Tambovtsev 2016-9-22
编辑： Image Analyst 2016-9-22
Suppose we have an array r=(2,2,2) filled with zeros and ones. How to count up how many zeros and how many ones do we have?

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Image Analyst
Image Analyst 2016-9-22
Try this:
numOnes = sum(r(:))
numZeros = numel(r) - numOnes
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Vadim Tambovtsev
Vadim Tambovtsev 2016-9-22
编辑：Image Analyst 2016-9-22
quality control:
dd=[ 3 7; 4 5]
num7=sum(find(dd==7))
output:
num7= 3
Why is it 3? isn't it supposed to be 1, because there is 1 "7" in the array?

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