On Sep 21, 2009, at 11:29 AM, David Young wrote:
Hello Group,
I'm trying to learn R and am having a problem getting output from a
function I'm trying to write. The problem is clearly one of scope,
but I can't find the documentation that tells me how to get around the
issue.
Here is an example of my problem.
testfunc<-function(x)
{ y<-10
print(y)
print(x)
}
testfunc(4)
The print function calls done inside testfunc have side effects of
printing to the console. See this additional code that demonstrates
that the returned value is actually "x" which is the last evaluated
object in the function. You should also look at the "return" function.
> z<-testfunc(4)
[1] 10 # side-effect but NOT the returned value
[1] 4
> z
[1] 4 # the returned value
?return
--
David.
The variables x and y are accessible during execution of the function
"testfunc" but not afterwards. I've read through the Introduction to
R, and the R language definition on functions, but do not see how to
define the output of the function, or change the scope of a function
variable using the R equivalent of a %global statement as would be
done in SAS. Can someone tell me either where I can look for more
information or how to make x and y accessible to operations after the
function is run?
Thanks in advance for any suggestions.
--
Best regards,
David Young
Marketing and Statistical Consultant
Madrid, Spain
+34 913 540 381
http://www.linkedin.com/in/europedavidyoung
mailto:dyo...@telefonica.net
______________________________________________
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
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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.
