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

Matteo Bertini matteo at naufraghi.net
Thu Dec 30 17:25:48 CET 2010

Il giorno 30/dic/2010, alle ore 16.03, Simon Urbanek ha scritto:

> 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.

Interesting, but is it possible to use this from the C code?


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