[R] save intermediate result

Weiwei Shi helprhelp at gmail.com
Fri May 4 22:55:36 CEST 2007

sorry for my English, staying in US over 7 years makes me think I were
ok, now :(

anyway, here is an example and why I need that:

suppose I have a function like the following:

f1 <- function(){
 line1 <- f2() # assume this line takes very long time, like more than 30 min
 # then I need to save line1 as an object into workspace b/c
 # the following lines after this might have some bugs
 # currently I use
 save(line1, file="line1.robj")
 # but I am thinking if there is anothe way, like enviroment, instead
of save it into a file

 # codes as followed might have some bugs
 # blabla...

if some codes as followed have bugs, my f1 function cannot return
anything, which means I have to re-run the time-consuming line again.



On 5/4/07, Joerg van den Hoff <j.van_den_hoff at fzd.de> wrote:
> On Fri, May 04, 2007 at 03:45:10PM -0400, Weiwei Shi wrote:
> > hi,
> >
> > is there a way to save a R object into workspace instead of into a
> > file during a running of function?
> >
> if I understand the question correctly you want the 'super-assignment'
> operator `<<-' as in
> -------------cut---------------
> R> f <- function(x) y <<- 2*x
> R> f(1)
> R> y
> [1] 2
> R> f(10)
> R> y
> [1] 20
> -------------cut---------------
> i.e. y is assigned a value in the 'workspace'. be careful, though, with
> this kind of assignment. why not return the object you are interested
> in as a list component together with other results when the function
> call finishes?

Weiwei Shi, Ph.D
Research Scientist
GeneGO, Inc.

"Did you always know?"
"No, I did not. But I believed..."
---Matrix III

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