[R] (a) R capacity and (b) sorting cases in R

Prof Brian Ripley ripley at stats.ox.ac.uk
Tue Jul 17 19:03:13 CEST 2007

On Tue, 17 Jul 2007, Dimitri Liakhovitski wrote:

> 1. I have a .txt file that has no more than 10 variables and about 3.5
> MILLION cases.
> Can R handle so many cases or should I not even try?

That's only about 300Mb.  On a >=4Gb RAM machine it should be fine, 
especially if you read it in carefully (not just use read.table without 
any options).

> 2. How do I sort cases (e.g., alphabetically) in R and then save the
> sorted results in a new file?


> Thank you!
> Dimitri
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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

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