[Rd] function call overhead

Paul Gilbert pgilbert at bank-banque-canada.ca
Wed Feb 16 19:13:36 CET 2011

(subject changed from: RE: [Rd] Avoiding name clashes: opinion on best practice naming	conventions)


Is this really true? Is there a speed advantage to defining a local function this way, say, within another function, and then calling it within a loop rather than the original? Do you have data on this?


> -----Original Message-----
> From: r-devel-bounces at r-project.org [mailto:r-devel-bounces at r-
> project.org] On Behalf Of Dominick Samperi
> Sent: February 16, 2011 12:44 PM
> Since the resolution of myPkg::foo() occurs at runtime (via a function
> call) instead
> of at compile time (as it would in C++), this practice can introduce a
> significant
> performance hit. This can be avoided by doing something like:
> mylocalfunc <- myPkg::foo
> [tight loop that uses mylocalfunc repeatedly]
> Here mylocalfunc would not be exported, of course.
> Dominick

La version française suit le texte anglais.


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