[R] builtin vs. closure

[Duncan Murdoch]

On 15/03/2009 12:00 AM, Edna Bell wrote:
> Dear R Gurus:
> 
> I'm working slowly through "R Programming for Bioinformatics", which
> is really interesting!
> 
> Anyway, my question now is:  what determines if a function is a
> builtin vs. a closure, please?

Closure is the normal type of function written in R code.  The other 
special types are built in to R; users can't create them except by 
modifying the R source code.  For details see the R Internals manual.

Duncan Murdoch

> 
> For instance:
>> typeof(sqrt)
> [1] "builtin"
>> typeof(mean)
> [1] "closure"
> 
> Thanks,
> Edna Bell
> 
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