On 22/06/2014, 6:00 AM, Ragia Ibrahim wrote:
> Dear group
> I have some thing like the following code...
> ##start
> my_list (global object)
>
> function 1
> {
> list1<-mylist
>
> function2(list1)
> function3(list1)
> function4(list1)
> }
>
> function2(list1)
> {
> assign values via <<- to the object items
> }
>
> function3(list1)
> {
> assign values via <<- to the object items
> }
> # end
>
>
> why after finishing each function the object variable is NULL..how can i keep
> its values across functions
The reason is that <<- doesn't do what you think it does. It is useful
in a very narrow context, but not the way you're using it. For what
you're doing, you don't need it. Here's a better way to get what you want:
Change function 1 to look like this:
list1 <- function2(list1)
list1 <- function3(list1)
list1 <- function4(list1)
and change functions 2, 3, 4 to not use <<-, but to return the modified
list, e.g.
function2 <- function(list1) {
list1 <- ...
list1
}
Duncan Murdoch
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