On Wed, 18 Feb 2004, Ko-Kang Kevin Wang wrote:
>
> One way to make your codes more efficient is to use "vectorisation" --
> vectorise your codes. I'm not sure where you can find more
> information about it, but an example would be to use the apply()
> function on a data frame instead using a loop. Avoid loops if you
> can.
Umm. No. Vectorization is definitely a good thing -- just about the only
coding change that improves both clarity and speed -- but replacing a loop
with apply() is not vectorisation in that sense.
Except for some cases of lapply, the apply functions are mostly clarity
optimisations rather than speed optimisations.
-thomas
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