On Jul 12, 2011, at 5:28 PM, Bos, Roger wrote:
All,
I am not understanding the scoping used in foreach when it is used
inside a function. I keep getting "could not find function" errors
for
functions that are in memory when I try to use foreach within a
function
call. I have a simple example below. "testFun" is in memory and
works
when called by foreach directly, but when I place foreach in a
function
called "helper" and then call helper, foreach cannot find "testFun".
Can anyone provide a fix? I hope its just a simple mistake on my part
and not a limitation of foreach.
I'm wondering if Uwe Ligges' posting in response to what seems like a
similar question not to long ago may have the answer. Details from the
header on my reader:
From: lig...@statistik.tu-dortmund.de
Subject: Re: [R] parallel computing with 'foreach'
Date: June 30, 2011 1:24:34 PM EDT
To: staceyjeanw...@gmail.com
--
david.
source(.trPaths[5], echo=TRUE, max.deparse.length=150)
"testFun" <- function(m) {
+ out <- m*m
+ }
out <- foreach(m=1:10, .combine=rbind) %dopar% testFun(m)
"helper" <- function(i) {
+
+ out <- foreach(m=1:i, .combine=rbind) %dopar% testFun(m)
+ }
out <- helper(10)
Error in testFun(m) : task 1 failed - "could not find function
"testFun""
Thanks,
Roger
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