create a function given a string

Hello,

I am trying to dynamically create/define a function inside of another
function (as part of a package.)

I build a string that looks something like this: "x + y" and what I need to
do is define a function f <- function(x,y) { x+y }.

This function "string" is much more complex than this example and depends on
other variables so there is no way to predict what the function will look
like.
The ultimate goal is to pass this function 'outer'

I have tried many different approaches and just can't find a way to convert
the string "x + y" to the function body x + y.

Any suggestions would be appreciated.

If I follow this correctly, then you know the names of the arguments, but 
not the statement that comprises the body of the function. How about 
something like this?

f<-function(x,y) eval(parse(text="x+y"))

I hope that this helps,
  John



________________________________
  John Fox
  Department of Sociology
  McMaster University
  email: jfox at McMaster.ca
  web: www.socsci.mcmaster.ca/jfox
________________________________

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