From ripley at stats.ox.ac.uk  Fri May 30 19:55:30 2008
From: ripley at stats.ox.ac.uk (Prof Brian Ripley)
Date: Fri, 30 May 2008 18:55:30 +0100 (BST)
Subject: [Rd] Reading an "unsigned long long" using R readBin()
In-Reply-To: <264855a00805291141s4d7537edkeda9b3ef3e627125@mail.gmail.com>
References: <264855a00805291141s4d7537edkeda9b3ef3e627125@mail.gmail.com>
Message-ID: <alpine.LFD.1.10.0805301850590.9386@gannet.stats.ox.ac.uk>

Well, R has no unsigned quantities, so ultimately you can't actually do 
this.  But using what="int" and an appropriate 'size' (likely to be 8)
shold read the numbers, wrapping around very large ones to be negative.
(The usual trick of storing integers in numeric will lose accuracy, but 
might be better than nothing.)

On Thu, 29 May 2008, Sean Davis wrote:

> Sorry for the simple question, but I am trying to read an "unsigned
> long long" using the R readBin() function.  Can someone point me in
> the right direction, or am I better off using C for such things?  The
> file that I am reading will have been produced on the same machine
> that is doing the reading.
>
> Thanks,
> Sean
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595



[Rd] Reading an "unsigned long long" using R readBin()
Prof Brian Ripley