[R] reading in ASCII files
Prof Brian Ripley
ripley at stats.ox.ac.uk
Mon Sep 24 15:03:57 CEST 2001
On Mon, 24 Sep 2001, Johann Petrak wrote:
> I wonder if there is a way to read in CSV files so that
> - certain fields within each record (line) are ignored, i.e.
> not converted to columns in the output data frame
No. We've thought about that, but it's better to use external tools
(e.g. cut in Unix).
> - factors/levels are created automatically: often, the possible
> labels are known in advance and could immediately be
> converted. This would save a lot of memory and time for
> bigger files, I assume.
What are these on the file? If characters then factors/levels *are*
created automatically. If codes then they are stored economically as
integers (in R-devel) and just need a levels attribute and class added.
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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