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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: numel or length, which is better?
Replies: 7   Last Post: Dec 14, 2014 9:29 PM

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Jos

Posts: 1,266
Registered: 10/24/08
Re: numel or length, which is better?
Posted: Feb 5, 2010 7:17 AM
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"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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