Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Aug 3 23:55:37 CEST 2004
On Tue, 3 Aug 2004, Thomas Lumley wrote:
> On Tue, 3 Aug 2004, Jack Tanner wrote:
> > > write.table(NULL)
> > Error in which(unlist(lapply(x, function(x) is.character(x) ||
> > is.factor(x)))) : argument to "which" is not logical
> > Is this correct behavior? It seems harsh to abort an entire run just
> > because one of the tables you generated happened to be NULL.
> Well, yes, in a perfect world write.table(NULL) would just write no
> output. It's arguably even a bug, or at least the fact that the same
> thing happens with a zero-length data frame is arguably a bug. I'll fix
It's zero-column cases it gets in trouble with: zero-row cases are handled
correctly AFAICS. Depends what `zero-length' means.
We should change it, although what is the right output is less clear to
me. You can have zero-columns and non-zero rows and with row names.
NULL data frame with 35 rows
(a column of rownames).
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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