R help - Apr 2009 - A way to get the R data stored temporarily in working memory?

Hey guys,

I have a problem: I created a silly for loop without saving the results 
on each step. After a while I realised that it will take days to finish 
the loop until I get the results.

Is there a way to get the data R saves in working memory or in a 
temporary file while runing the loop? So that stoping the loop will not 
result in complete data loss?

Thank you very much!

Greetings,
Friederiksen

Have a look at ?save and ?load. Those function will allow you to save an
R object to a file and reload it when needed.

HTH,

Thierry 


------------------------------------------------------------------------
----
ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
Belgium 
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be 
www.inbo.be 

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Friedericksen
Verzonden: maandag 27 april 2009 14:53
Aan: r-help at stat.math.ethz.ch
Onderwerp: [R] A way to get the R data stored temporarily in working
memory?

Hey guys,

I have a problem: I created a silly for loop without saving the results 
on each step. After a while I realised that it will take days to finish 
the loop until I get the results.

Is there a way to get the data R saves in working memory or in a 
temporary file while runing the loop? So that stoping the loop will not 
result in complete data loss?

Thank you very much!

Greetings,
Friederiksen

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and provide commented, minimal, self-contained, reproducible code.

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On 4/27/2009 8:52 AM, Friedericksen wrote:
> Hey guys,
> 
> I have a problem: I created a silly for loop without saving the results 
> on each step. After a while I realised that it will take days to finish 
> the loop until I get the results.
> 
> Is there a way to get the data R saves in working memory or in a 
> temporary file while runing the loop? So that stoping the loop will not 
> result in complete data loss?
> 
> Thank you very much!
You can use an explicit save() to write out a list of variables (or 
save.image() to write out all of them) but then you need to work out how 
to restart from one of these images.

Duncan Murdoch

Using write() with append=T should work. Just be careful not to open the
text file with a program that will lock it while the loop is still running.
Text editors will not usually lock the file so in windows you could use
notepad to take a look at the output and copy/paste to somewhere else.


e.g.

a <- vector(length=100000)
for (i in 1:100000){
a[i]<-rnorm(1)
write(a[i], "temp.txt", append=T) ## append your new bit of data to
the text
file at each iteration of the loop
}









andydolman@gmail.com


2009/4/27 Friedericksen <golum23@gmx.de>
> Hey guys,
>
> I have a problem: I created a silly for loop without saving the results on
> each step. After a while I realised that it will take days to finish the
> loop until I get the results.
>
> Is there a way to get the data R saves in working memory or in a temporary
> file while runing the loop? So that stoping the loop will not result in
> complete data loss?
>
> Thank you very much!
>
> Greetings,
> Friederiksen
>
> ______________________________________________
> R-help@r-project.org 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.
>
	[[alternative HTML version deleted]]

Hey,

that is very cool! But there is a problem: I use Emacs with ESS. When I 
press ESC, I get some emacs keybinding. What is R doing when I press 
ESC? Which function is then executed? I think it should also work with 
ESS, but I have to press the specific keybinding.

Thank you very much for the answer!

Greetings