[R] hash argument of new.env()

Thomas Lumley tlumley at u.washington.edu
Tue Oct 8 18:16:51 CEST 2002

On Tue, 8 Oct 2002, Jonathan Rougier wrote:

> Hi everyone,
> There is no mention in ?new.env (R-1.6.0) of what the effect of setting
> the hash argument of new.env() actually does.  What does it mean in
> performance terms to say that "the environment will be hashed"?

If the environment has a lot of things in it then lookup should be faster
with hashing -- it should be roughly independent of the number of things
in the environment.   I believe that in the bioconductor project this is
actually noticeable when you have data on 5000 genes in an environment.


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