[R] data.frame size limit
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Jun 9 08:25:11 CEST 2004
On Tue, 8 Jun 2004, Philip Sobolik wrote:
> Is there a limit to the number of columns that a data.frame can have?
Yes. A data frame is a list, and a list is limited to 2^31-1 items.
> example, can I read.csv() a file that has 1000 columns and 10,000 rows,
> will it break or is it limited by available memory.
It will not `break', but it may fail with an error message, depending how
much the `available memory' is. R will run in 16Mb RAM but this problem
Both ?read.table and the R Data Import/Export Manual give hints on how to
read large tables efficiently, and it may well be necessary to follow
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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