for() does not creae separete bindings for the index each iteration,
so the function bodies see the global binding of i, which in this case
will be the final value. One possible solution is to use local(), e.g.
for(i in 1:3){
assign(paste("f",i,sep=""),
local({
k <- i # create local binding with current loop index value
function(x) x + k
}))
}
luke
On Thu, 26 Mar 2009, Florin Maican wrote:
Hi
I want to create the following functions in a loop
f1<-function(x){x+1}
f2<-function(x){x+2}
f3<-function(x){x+3}
Output f1(2)=3
f2(2)=4
f3(2)=5
I tried to create the in a loop as bellow but I get wrong on answers
because the value of i change
for(i in 1:3){
assign(paste("f",i,sep="")
,function(x)
x+i
)
} # end for
Output f1(2)=5
f2(2)=5
f3(2)=5
But it is not what I want. The question is how I can
fix in R the value of "i" in my functions? I tried to use assign() and
get(),but I did not manage.
Thanks in advance,
Florin
--
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: [email protected]
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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