Dynamic Dictionary Data Type? 2005-06-02 - By Thomas Lumley
On Thu, 2 Jun 2005, hadley wickham wrote:
>> 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.
>
An environment is a hash table, and copying occurs only on modification,
when any language would have to copy in this context.
-thomas
______________________________________________
R-help@(protected) mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
|
|
