count even elements vector

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Akash Sinhal
Akash Sinhal 2018-10-14
重新打开： Guillaume 2018-10-14
I have wrote this to identify the even numbers x = vec(mod(vec,2)==0); how do I edit it so it returns how many integers of even numbers there are within this single command.

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采纳的回答

Guillaume
Guillaume 2018-10-14
Isn't it trivial? Using sum:
sum(mod(myvec, 2) == 0)
Or using nnz:
nnz(mod(myvec, 2) == 0)

更多回答（2 个）

Kevin Chng
Kevin Chng 2018-10-14
you may use length(), or numel()
Image Analyst
Image Analyst 2018-10-14
Yet another option, this time using rem() for remainder:
myvec = randi(10, 1, 20) % Sample data.
numEvenNumbers = sum(rem(myvec, 2) == 0)

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