Rene,
What you have below does not make much sense. You have not provided a
definition for fun.dat() nor have you given an example with which to run
any of your functions.
The issue you raise about passing 'dat variable as a parameter as it can
get pretty large' is not an issue.
Observe:
------------------
x <- rnorm(1000000)
gc()
used (Mb) gc trigger (Mb) max used (Mb)
Ncells 136213 3.7 350000 9.4 350000 9.4
Vcells 1091921 8.4 1540913 11.8 1091931 8.4
mean(x)
[1] -0.0004251693
gc()
used (Mb) gc trigger (Mb) max used (Mb)
Ncells 136405 3.7 350000 9.4 350000 9.4
Vcells 1091962 8.4 1697958 13.0 1092837 8.4
object.size(x)
[1] 8000024
mean(2*x)
[1] -0.0008503386
gc()
used (Mb) gc trigger (Mb) max used (Mb)
Ncells 136413 3.7 350000 9.4 350000 9.4
Vcells 1091962 8.4 2441693 18.7 2091968 16.0
-------------------
x occupies most of the Vcells in R's memory.
And the 'max used' does not increase when mean(x) is called - in other
words, no copy of x is performed.
Only when another object is created ( '2*x' ) does 'max used' increase -
almost doubling.
So, as long as you are not modifying 'dat' (in which case a local copy is
made) , I think there is nothing to worry about.
HTH,
Chuck
On Sat, 4 Oct 2008, Ren? Holst wrote:
I haven't quite figured out how I can change the environment of a function.
I have a main function and want to use different auxillary functions, which I
supply as parameter (or names). What I want to do is something like this:
main.fun=function(aux.fun,dat){
x <- 1
fun.dat()
}
aux.fun.one=function(){
mean(dat)+x
}
aux.fun.one=function(){
median(dat)-x
}
I don't want to transfer the dat variable as a parameter as it can get pretty
large. The enclosing environment of both auxillary functions is the Global
environ, so they cannot see neither dat nor x as they exist inside the scope of
the main function. So how do I do this?
Thanks,
Ren?
[[alternative HTML version deleted]]
Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
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