Thanks Hadley, for some reason I didn't see your email until now. It
works fine with the development version,
library(plyr)
df <- data.frame(a=1:10 , b=1:10)
foo1 <- function(a, b, cc=0, d=0){
a + b + cc + d
}
mdply(data. = df, foo1, cc=1, d=2)
I think using . prefixes is a safer option (and possibly more
consistent with R customs), although that means the current code using
plyr will have to be modified.
Congratulations on the new ggplot2 release too!
Thanks,
baptiste
On 5 Oct 2008, at 14:39, hadley wickham wrote:
On Sun, Oct 5, 2008 at 8:02 AM, Auguie, Baptiste
<[EMAIL PROTECTED]> wrote:
Dear list and Hadley,
The new plyr package seems to provide a clean and consistent way to
apply a function on several arguments. However, I don't understand
why the following example does not work like the standard mapply,
library(plyr)
df <- data.frame(a=1:10 , b=1:10)
foo1 <- function(a, b, cc=0, d=0){
a + b + cc + d
}
mdply(df, foo1, cc=1) # fine
mdply(df, foo1, d=1) # fails
mdply(df, foo1, cc=1, d=2) # fails
Unfortunately this bug is R's partial name matching: d = 2 -> data. =
2. You should be able to fix this by manually specifying mdply(data.
= df, foo1, cc=1, d=2) but there are some bugs in the current version
that prevent this from happening. I've fixed this in the development
version, available from http://github.com/hadley/plyr (click the
download link)
However, the whole point of plyr is that you should have to think
about this kind of thing, so I'll revisit my naming scheme - probably
to use . prefixes instead of suffixes.
Hadley
--
http://had.co.nz/
_____________________________
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
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