Please do read ?apply (see the posting guide)
If 'X' is not an array but has a dimension attribute, 'apply'
attempts to coerce it to an array via 'as.matrix' if it is
two-dimensional (e.g., data frames) or via 'as.array'.
and note
sapply(esoph, class)
$agegp
[1] "ordered" "factor"
$alcgp
[1] "ordered" "factor"
$tobgp
[1] "ordered" "factor"
$ncases
[1] "numeric"
$ncontrols
[1] "numeric"
On Fri, 1 Aug 2008, David Hajage wrote:
Hello R users,
I run this code under windows XP and R 2.7.1 :
head(esoph)
agegp alcgp tobgp ncases ncontrols
1 25-34 0-39g/day 0-9g/day 0 40
2 25-34 0-39g/day 10-19 0 10
3 25-34 0-39g/day 20-29 0 6
4 25-34 0-39g/day 30+ 0 5
5 25-34 40-79 0-9g/day 0 27
6 25-34 40-79 10-19 0 7
class(esoph$agegp)
[1] "ordered" "factor"
class(esoph$alcgp)
[1] "ordered" "factor"
class(esoph$tobgp)
[1] "ordered" "factor"
class(esoph$ncases)
[1] "numeric"
class(esoph$ncontrols)
[1] "numeric"
apply(esoph, 2, class)
agegp alcgp tobgp ncases ncontrols
"character" "character" "character" "character" "character"
I don't understand why the result is all "character"...
Thanks a lot.
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--
Brian D. Ripley, [EMAIL PROTECTED]
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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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
