r - update function inputs in global environment -

let's have dataframe df , list obj.

df<- data.frame(x=c(1, 2, 3, 4),                 y=c(1, 2, 3, 4))  obj <- list(data.frame(z=c(0, 0, 0, 0),                        a=c(0, 0, 0, 0)),             data.frame(b=c(0, 0, 0, 0))) 

i create function myfun modifies 1 column in df , adds list obj. how update both x , o in global environment? in other words, how have function update df , obj?

myfun <- function(x, o) {   x[1] <- x[,1]*2   o <- list(o, x[1]) }  myfun(df, obj) 

there's global assignment (eg <<-),

myfun1 <- function(x, o) {                                                          x[1] <- x[,1]*2                                                                   o <- list(o, x[1])                                                                df <<- x                                                                          obj <<- o                                                                       } 

or try returning objects function, using list2env multiassignment.

myfun2 <- function(x, o) {                                                          x[1] <- x[,1]*2                                                                   o <- append(o, x[1])                                                              list(obj=o, df=x) #setting names here important list2env                                                              }                                                                                  list2env(myfun2(df, obj), environment())                                          

alternatively, pass in environment. in r, environments pass-by-reference,

myfun3 <- function(e) {                                                             e$df[1] <- e$df[,1]*2                                                             e$obj <- append(e$obj, e$df[1])                                                 }                                                                                  myfun3(environment())