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Topic: numel or length, which is better?
Replies: 6   Last Post: Apr 16, 2013 3:44 PM

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hesham

Posts: 1
Registered: 9/12/07
Re: numel or length, which is better?
Posted: Apr 16, 2013 3:03 PM
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A=magic(4)
length(A)
numel(A)

length calculate the number of column whereas numel calculate the number of element

"Jos (10584)" wrote in message <hkh28g$9mq$1@fred.mathworks.com>...
> "red " <828bwv@googlemail.com> wrote in message <hkh0jh$sdb$1@fred.mathworks.com>...
> > Which is correct/better usage for vectors (1-by-n, n-by-1)?
>
> LENGTH is somewhat tricky since it returns the largest of the sizes in all dimensions. It can become nasty to debug errors when you supply matrices instead of vectors.
>
> I always use NUMEL to find the number of elements, which is as clear as it can get.
>
> Although I do not know the internal processes going on in LENGTH and NUMEL, I assume that LENGTH requires more internal steps.
>
> hth
> Jos




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