RE: [R] Dynamic Dictionary Data Type?

From: Liaw, Andy <andy_liaw_at_merck.com>
Date: Fri 03 Jun 2005 - 00:39:43 EST


AFAIK R does copy-on-modify, so if you call f(aList, ...) and inside f() aList is not modified, then a copy is not really made.

Andy

> From: hadley wickham
>
> > cache results. Other languages usually offer a dictionary data type
> > which I can use as an efficient way to dynamically cache already
> > calculated results - what's the best way to do this in R?
>
> It really depends on what sort of data you want to cache - if it is
> fundamentally 1D, use a vector, 2D use a matrix etc. The closest
> equivalent to dictionary/hashmap is a list - however R's pass a copy
> semantics might slow things down if you are caching a lot of data.
>
> Hadley Wickham
> http://had.co.nz
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Jun 03 00:48:46 2005

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