I have never seen the report in the repository. There were problems with
R-bugs at around that time (most email submission was stalled for a month
or so).
However, I think the problems are far more serious: the help page says
Returns a matrix of integers indicating their column number in a
matrix-like object.
...
as.factor: a logical value indicating whether the value should be
returned as a factor rather than as numeric.
Value:
An integer matrix with the same dimensions as 'x' and whose
'ij'-th element is equal to 'j'.
There is no mention of using the column labels as the values and the
result was not even a matrix. I certainly expected the factor levels to
be numeric.
I presume that the intention is to use the column labels (default
seq_len(nrow(x)) ) in place of the numbers, and to return a factor matrix,
so I have implemented that for col() and row().
However, I do wonder that anyone was using as.factor=TRUE given that it
did not do anything like what it was documented to.
On Mon, 8 Dec 2008, Dan Davison wrote:
This bug was reported to r-devel by Martin Morgan on 13th May 2008
(original email pasted below). However I couldn't locate it in the bug
tracker (with searches for row, col, as\.factor) It is still present
in today's svn version (rev 47115). I hope I'm doing something useful
by bringing it up again. I have not sent this to r-bugs, as I'm
concerned that not locating it in the bug tracker could be my failing.
Dan
original report:
------------------------------------------------------------------
col(matrix(0, 5, 5), as.factor=TRUE) fails
col(matrix(0, 5, 5), as.factor=TRUE)
Error in factor(.Internal(col(dim(x))), labels = colnames(x)) :
invalid labels; length 0 should be 1 or 5
when the matrix has no dimnames. This is not as advertised. I would
have expected the equivalent of
factor(.Internal(col(dim(x))),
labels=colnames(x, do.NULL=FALSE, prefix=""))
sessionInfo()
R version 2.8.0 Under development (unstable) (2008-05-13 r45682)
x86_64-unknown-linux-gnu
Martin
--
Martin Morgan
Computational Biology / Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N.
PO Box 19024 Seattle, WA 98109
Location: Arnold Building M2 B169
Phone: (206) 667-2793
------------------------------------------------------------------
--
http://www.stats.ox.ac.uk/~davison
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--
Brian D. Ripley, rip...@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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