[Rd] R's IO speed
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Dec 27 14:39:16 CET 2004
On Sun, 26 Dec 2004, Dirk Eddelbuettel wrote:
> On Sun, Dec 26, 2004 at 08:16:56AM -0500, Frank E Harrell Jr wrote:
>> Brian - I really appreciate your work on this, and the data. The wise
>> use of read.table that you mentioned should be fine for almost
>> everything I do. There may be other users who need to read larger
>> datasets for which memory usage is an issue. They can speak for
>> themselves though.
> Thanks as always for the near constant improvements to R.
> One possible improvement would be more explicit examples, maybe in a
> \dontrun environment, showing some possible data file format and how
> arguments like colClasses can help increase performance over the naive use
> (that I am still using almost exclusively).
That's the purpose of the R-data manual, which had some and now has more,
including timings of examples where it matters and where it does not.
Those are showing speeds of well over a million items a second.
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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