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From: Gerrit Hofbauer on 11 Mar 2010 11:32
"James Tursa" <aclassyguy_with_a_k_not_a_c(a)hotmail.com> schrieb im
Newsbeitrag news:hnb4li$1oq$1(a)fred.mathworks.com...
>
> The vector behavior needs to be present in the function itself. Otherwise
> you will have to use a loop in the calling routine. e.g., you could change
> your function code to something like this:
>
> xlt2 = x < 2;
> xlt500 = (~xlt2) & (x < 500);
> f = ones(size(x)) * 0.44;
> f(xlt2) = 24./x(xlt2);
> f(xlt500) = 18.5./x(xlt500).^0.6;
>
> All of that logical indexing does incur a memory and speed penalty which
> may be an issue for very large x. This could be avoided in the above case
> by using a C mex routine if necessary.
>
> James Tursa

I didn't even know there was something like logical indexing. That should
help me for further work to come.

Thanks a lot to everyone!

Gerrit

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