On 3/25/2009 11:47 AM, Joerg Betzin wrote:
Dear R-helpers,
I try to use nested R-functions as follows:
You didn't use nested functions. They would look like this:
help1 <- function(){
help2 <- function(){
if (x == 1)
cat("Hello world x = 1")
}
x <- 1
help2()
}
Because help2 is now nested within help1, it can see all the local
variables in help1, so things work with it done this way.
There are tricks to define help2 outside of help1 but allow it to see
the variables within there, but I'd keep it simple and avoid them.
Duncan Murdoch
help1 = function(){
x = 1
help2()
}
with
help2 = function(){
if (x == 1)
cat("Hello world x = 1")
}
If I compile these functions and run help1()
an error message occurs
Fehler in help2() : objekt "x" nicht gefunden
in english "error in help2(): object "x" not found"
If I change help1 to
help1 = function(){
x <<- 1
help2()
}
so that "x" is now defined at the global environment it works fine.
But the problem is, now "x" is defined also outside of help1 and this is
not desired !
Is there any usable solution for this problem?
But, the original problem is to assign new values for "x" in help1 inside
help2 !
Thanks in advance
Jörg Betzin
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