Hi all, How to store recursive resutls from a function for each step without using global operators <<-? Thanks ahead. Xiaohui Chen Dept. of Statistics UBC, Canada _________________________________________________________________ Don?t waste time standing in line?try shopping online. Visit Sympatico / MSN
One suggestion: as a recursive list. For example have a look at the 'party' package and the BinaryTree class. I hope this helps. B?lint On 22/09/06, X.H Chen <xchen_stat at hotmail.com> wrote:> Hi all, > > How to store recursive resutls from a function for each step without using > global operators <<-? Thanks ahead. > > Xiaohui Chen > > Dept. of Statistics > UBC, Canada > > _________________________________________________________________ > Don't waste time standing in line?try shopping online. Visit Sympatico / MSN > > > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > >
Note that <<- is not necessarily global:
if (exists("x")) rm(x)
f <- function() {
x <- 2
g <- function() x <<- 3
g()
x
}
f() # 3
exists("x") # FALSE
On 9/22/06, X.H Chen <xchen_stat at hotmail.com>
wrote:> Hi all,
>
> How to store recursive resutls from a function for each step without using
> global operators <<-? Thanks ahead.
>
> Xiaohui Chen
>
> Dept. of Statistics
> UBC, Canada
>
> _________________________________________________________________
> Don't waste time standing in line?try shopping online. Visit Sympatico
/ MSN
>
>
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
>
Hi Patrick,
Thanks for your suggestion. I find your method works for the functions with
integer paramters. For example,
If we have function f:
f<-function(i)
{
if(i>1)
i*f(i-1)
else
1
}
and then using:
ans <- vector("list", n)
for(i in 1:5) {
ans[[i]] <- f(i)
}
the ans should be:
[[1]]
[1] 1
[[2]]
[1] 2
[[3]]
[1] 6
[[4]]
[1] 24
[[5]]
[1] 120
But actually, we there is no such a "i" can be referrenced in f(), no
parametric function for example, this will be a problem. Anyway, thanks a
lot for your suggestions.
Cheers,
Xiaohui Chen
Dept. of Statistics
UBC, Canada
>From: Patrick Burns <pburns at pburns.seanet.com>
>To: "X.H Chen" <xchen_stat at hotmail.com>
>Subject: Re: [R] how to store recursive results
>Date: Fri, 22 Sep 2006 10:26:35 +0100
>
>It isn't clear to me exactly what you are asking, but
>I think that a list might be what you are after. Something
>like:
>
>ans <- vector("list", n)
>for(i in 1:n) {
>ans[[i]] <- ....
>}
>
>X.H Chen wrote:
>
>>Hi all,
>>
>>How to store recursive resutls from a function for each step without
using
>>global operators <<-? Thanks ahead.
>>
>>Xiaohui Chen
>>
>>Dept. of Statistics
>>UBC, Canada
>>
>>_________________________________________________________________
>>Don?t waste time standing in line?try shopping online. Visit Sympatico /
>>MSN
>>
>>------------------------------------------------------------------------
>>
>>______________________________________________
>>R-help at stat.math.ethz.ch mailing list
>>https://stat.ethz.ch/mailman/listinfo/r-help
>>PLEASE do read the posting guide
>>http://www.R-project.org/posting-guide.html
>>and provide commented, minimal, self-contained, reproducible code.
>>
>>