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
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