Dear list,
I often need to convert several variables from numeric or integer into
factors (before plotting, for instance), as in the following example,
d <- data.frame(
x = seq(1, 10),
y = seq(1, 10),
z = rnorm(10),
a = letters[1:10])
d2 <-
within(d, {
x = factor(x)
y = factor(y)
})
str(d)
str(d2)
I'd like to write a function factorise() which takes a data.frame and
a vector of variable names, and returns the original data.frame with
the desired variables converted to factor,
factorise <- function(d, f)
***ply(d, f, factor) # some apply function
also, perhaps a defactorise() function doing the reverse operation
with as.numeric.
I played with the plyr package and the base apply family for a while
but can't find any concise construct.
Best regards,
baptiste
_____________________________
Baptiste Auguié
School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK
Phone: +44 1392 264187
http://newton.ex.ac.uk/research/emag
______________________________________________
[email protected] mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
