[R] Confusion regarding environments invoked by "source" command
Duncan Murdoch
murdoch at stats.uwo.ca
Mon Mar 23 23:31:01 CET 2009
On 23/03/2009 6:06 PM, Dennis Fisher wrote:
> Colleagues,
>
> R version 2.8.1 in OS X
>
> Within a function (which is already within a function), I am sourcing
> a file. The syntax of the command is something like (this is just an
> example; the actual code is much more complicated):
This code works just as expected, once you make it syntactically
correct. I suspect you have something else wrong in the real case.
Here's my log:
> BIGFUNCTION<- function()
+ {
+ DATAFRAME<- data.frame(a=1:3,b=4:6)
+ MYFUNCTION(DATAFRAME)
+ }
>
> MYFUNCTION<- function(DATAFRAME)
+ {
+ print(ls())
+ exists("DATAFRAME")
+ source("myfile.R", local=T)
+ }
> BIGFUNCTION()
[1] "DATAFRAME"
a b
1 1 4
2 2 5
3 3 6
Duncan Murdoch
> BIGFUNCTION <- function()
> {
> DATAFRAME <- [some commands to create a dataframe]
> MYFUNCTION(DATAFRAME)
> }
> MYFUNCTION <- function(DATAFRAME)
> {
> print(ls())
> exists("DATAFRAME")
> source("myfile", local=T)
> }
>
> The file "myfile" contains the following:
> print(DATAFRAME)
>
> When I execute BIGFUNCTION from the command line, R reports:
> Error in print(DATAFRAME) : object "DATAFRAME" not found
> Calls: BIGFUNCTION ... source -> eval.with.vis -> eval.with.vis ->
> print -> head
> Execution halted
> However, the "print(ls())" command has just listed the existence of
> DATAFRAME and "exists(DATAFRAME) return TRUE
> So, I am at a loss as to why ls() and "exists" see the object but
> print(DATAFRAME) command does not.
>
> I tried "local=F" in the source command to no avail.
> I also replaced "print(DATAFRAME)" with "print(str(DATAFRAME))" with
> the same outcome.
> I assume that this is an error as to how I am managing environments
> but I cannot figure out a solution. Any help would be appreciated.
>
> Dennis
>
>
>
> Dennis Fisher MD
> P < (The "P Less Than" Company)
> Phone: 1-866-PLessThan (1-866-753-7784)
> Fax: 1-415-564-2220
> www.PLessThan.com
>
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