Thank you Uwe. I always forget about how environments are embedded within each other.
On Fri, Dec 27, 2013 at 9:33 AM, Sébastien Bihorel <[email protected]> wrote: > Hi, > > I have a problem of variable scope illustrated by the following example > (this examples greatly simplifies the actual code I am working on but I > unfortunately cannot share it). I have two functions, funa and funb: funb > is called within funa. The goal of funb is to modify variables created > within funa and also perform some some action using these variables. > Obviously, there is something wrong with this code because the variables > aa, bb, and cc have different values when they are printed in funa or funb. > > I have read the section about scope in the Introduction to R manual and do > not really understand why my code is not working. Any suggestion will be > greatly appreciated. > > Thanks > > ##### CODE STARTS HERE #### > > funa <- function(x){ > # here is some code that defines the variables aa, bb, cc > aa <- 11 > bb <- 21 > cc <- 31 > # fun b uses some input variable of funa to modify aa, bb, and cc > funb(x) > cat(sprintf('funa: aa=%s, bb=%s, cc=%s\n',aa,bb,cc)) > } > > funb <- function(x){ > > aa <<- pi*x > bb <<- 5*x > cc <<- sin(x) > cat(sprintf('funb: aa=%s, bb=%s, cc=%s\n',aa,bb,cc)) > > # Not executed > # here is some code that would do something with aa, bb, and cc > # plot(aa,bb) > } > > funa(5) > [[alternative HTML version deleted]]
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