From hadley at rice.edu  Thu Dec 30 21:34:18 2010
From: hadley at rice.edu (Hadley Wickham)
Date: Thu, 30 Dec 2010 14:34:18 -0600
Subject: [Rd] key-value mapping in C inside R?
In-Reply-To: <4D1C8012.7050403@naufraghi.net>
References: <4D1C8012.7050403@naufraghi.net>
Message-ID: <AANLkTinpt1Ssi2Cg4SRgtmkSPib9UGA4fggZmVM=tmuu@mail.gmail.com>

Why not use a sparse Matrix package?
Hadley

On Thu, Dec 30, 2010 at 6:50 AM, Matteo Bertini <matteo at naufraghi.net> 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?
>
> Thanks,
> Matteo Bertini
>
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>



-- 
Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University
http://had.co.nz/



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