[Rd] key-value mapping in C inside R?

[Simon Urbanek]

On Dec 30, 2010, at 7:50 AM, Matteo Bertini wrote:

> I'm testing some modifications in arima.c.
> I've noticed that a big internal array of double (rbar) is usually sparse and I'd like to add an option to store it as key-value mapping.
> 
> Is there a library function or some other approach already used inside the R core for key-value mappings?
> 

environment created with hash=TRUE, e.g.:
e = new.env(TRUE, emptyenv())
e[["foo"]] = "bar"

You can even set "size" with the expected size if you know it in advance.

Cheers,
Simon