[R] Help with R
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu May 5 14:56:23 CEST 2005
On Thu, 5 May 2005, Christoph Lehmann wrote:
>>> I heard that 'R' does not do a very good job at handling large
>>> datasets, is this true?
>>
> importing huge datasets in a data.frame with e.g. a subsequent step of
> conversion of some columns into factors may lead into memory troubles
> (probably due to memory overhead when building out factors). But we currently
Note that R's scan() does this very much more efficiently. It is not fair
to R to generalize from the method of a contributed package.
> succeeded in importing 12 millions of data records stored in a MySQL
> database, using RMySQL package.
--
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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