I'm trying to write a simple function with a data parameter.
tfun <- function(x, y, data = NULL) {
if(missing(data))
dt <- data.frame(x=x, group=y)
else {
dt <- with(data, data.frame(x=x, group=y))
}
return(dt)
}
If I pass variables "weight" and "grp" from a data.frame, d, like
this: tfun(d$weight, d$grp), the function works. However, if I try to
do the same thing by supplying d, like this: tfun(weight, grp,
data=d), I receive the following error:
Error in data.frame(x = x, group = y) : object "weight" not found
Can someone please tell me what I'm doing wrong?
Greg.
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