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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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
