R help - Jul 2010 - Loading .Rdata within an R function

Colleagues:

I am having trouble loading data from within .Rdata file
within the environment of a function.  That is,
the following always loads to the global environment:

   f1 <- function()    {

           load("mydata.Rdata")

           #  compute with objects from mydata.Rdata.

           }

I wish to load mydata.Rdata only within the function f1.
Perhaps I have misunderstood the capabilities of load(),
or the environment concepts.

Thank you for any help you may give.
Cordially,
Giles Crane

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On Jul 8, 2010, at 3:21 PM, Giles Crane wrote:
> Colleagues:
>
> I am having trouble loading data from within .Rdata file
> within the environment of a function.  That is,
> the following always loads to the global environment:
>
>   f1 <- function()    {
>           load("mydata.Rdata")
>           #  compute with objects from mydata.Rdata.
>           }
>
> I wish to load mydata.Rdata only within the function f1.
> Perhaps I have misunderstood the capabilities of load(),
> or the environment concepts.
How do you know that you are having troubles? I don't see any error  
messages.
>
David Winsemius, MD
West Hartford, CT

On 08/07/2010 3:21 PM, Giles Crane wrote:
> Colleagues:
>
> I am having trouble loading data from within .Rdata file
> within the environment of a function.  That is,
> the following always loads to the global environment:
>
>    f1 <- function()    {
>
>            load("mydata.Rdata")
>
>            #  compute with objects from mydata.Rdata.
>
>            }
>
> I wish to load mydata.Rdata only within the function f1.
> Perhaps I have misunderstood the capabilities of load(),
> or the environment concepts.

You didn't specify where you wanted it loaded.  Just add 
envir=environment() to the call to load.

Duncan Murdoch