[R] variable scope

[VBMorozov@lbl.gov]

Dear R-guRus:

I would like to pass variables to a function in R in "by reference", 
e.g Fortran style.
For example, suppose I have the following code

x<-c(1:10)
y<-1
MyFunc<-function(x,y) {y<-sum(x); return(NULL)}
MyFunc(x,y)
print(y)

in this case print(y) will produce "1" instead of 55 (which is sum(x)) -
 how do I make sure that afte the function is run, y remembers the 
value that was given to it within a function ????

Of course I could always do something like 

MyFunc<-fuction(x) {return(sum(x)}; y<-MyFunc(x)

but in the real life I have a much more complex problem so I really 
would like to be able to pass variables to functions by reference.

Thank you very much,
Vladimir



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