Greg wrote:
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?
Hi Greg,
In your function definition, the data argument isn't missing, it's NULL.
You have to test like this:
if(is.null(data)) ...
Does that fix it?
Jim
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