S Ellison a écrit :
As a work-round, try something lik
test.function <- function (formula.str, data) {
weights <- rep(.1, 8)
rpart(as.formula(formula.str), data, weights)
}
which works if formula.str is a string instead of a formula object.
Ok, I think I got the point. The only problem with transforming the
string to a formula is that rpart raises another error:
Error in t.default(x) : argument is not a matrix
test.function <- function (form, data) {
weights <- rep(.1, 8)
environment(form)<-environment() #re-sets the formula environment
rpart(form, data, weights)
}
This works perfectly well. It will be good enough for what I need.
Thanks a lot ;-)
Xavier
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