On Fri, 18 Aug 2006, Tom Boonen wrote:
> Dear List,
>
> why does as.data.frame(cbind()) transform numeric variables to
> factors, once one of the other variablesused is a character vector?
>
> #
> x.1 <- rnorm(10)
> x.2 <- c(rep("Test",10))
> Foo <- as.data.frame(cbind(x.1))
> is.factor(Foo$x.1)
>
> Foo <- as.data.frame(cbind(x.1,x.2))
> is.factor(Foo$x.1)
> #
>
> I assume there is a good reason for this, can somebody explain? Thanks.
Only if you can explain the good reason why you did not just use
data.frame(x.1, x.2)!
cbind() makes a matrix out of vectors, here a character matrix. And then
as.data.frame() converts character columns to factors.
--
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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