Calling rpart from a function

["Paul Lasky" <phlasky@earthlink.net>]

This is a tiresome inquiry that has been addressed many times in this form, but I just don't know how to do it.

 

 I wish to call the function rpart from a function that I wrote:

 

   myfunction = function(args ... ) {

     . . .

   temp = rpart(y ~ x1+x2+x3,  control=rpart.control(minsplit = n) )

 

 . . .

  }

 

Of course this type of call doesn't work because the frame referenced by myfunction can't access the main

frame where rpart resides.  Neither does the trick of  using 

   do.call("rpart.control", minsplit = n )

   do.call("rpart", args)

work.

 

 The S-Plus "Programmer's Manual"  cautions that a user must use a "custom frame" but doesn't explain

really how to do this.

 

 Can anyone advise on the correct procedure for calling library functions from within a scripted function ?

 

 Paul H. Lasky

 P & B Consultants

  

 

 

 

 

Paul Lasky

phlasky@earthlink.net