R help - Sep 2003 - Problem with memory for large datasets

Hello,

I would like to know if there is a possibility to "clean" the R memory
during a R session. In fact, I realize a lot of instruction with large
objects (matrix of 500*5000), and I can not manage to achieve the end of my
script due to memory lack. Of course, I've tried to remove all
"temporary
object" during the script execution and to perform a garbage collector ...
But it seems to have no effect ...

Any idea to solve this problem without an exit from R ?

Regards

Isabelle

Isabelle Zabalza-Mezghani
IFP - Reservoir Engineering Department
Rueil Malmaison - France

ZABALZA-MEZGHANI Isabelle wrote:
> Hello,
> 
> I would like to know if there is a possibility to "clean" the R
memory
> during a R session. In fact, I realize a lot of instruction with large
> objects (matrix of 500*5000), and I can not manage to achieve the end of my
> script due to memory lack. Of course, I've tried to remove all
"temporary
> object" during the script execution and to perform a garbage collector
...
> But it seems to have no effect ...
> 
> Any idea to solve this problem without an exit from R ?
> 
> Regards
> 
> Isabelle
After you have removed unnecessary objects, the only thing you can do is 
to increase the memory limit R uses (given you are on Windows). See 
?memory.limit for details.
Attention: raising it will cause your system to begin swapping heavily.

The best solution is to buy some more memory and/or optimize your code 
(given that's possible).

Uwe Ligges

What have you done to remove "temporary objects"?  Does this include 
"rm(list='ls()')"  or "remove(list=objects())"? 

hope this helps.  spencer graves

ZABALZA-MEZGHANI Isabelle wrote:
>Hello,
>
>I would like to know if there is a possibility to "clean" the R
memory
>during a R session. In fact, I realize a lot of instruction with large
>objects (matrix of 500*5000), and I can not manage to achieve the end of my
>script due to memory lack. Of course, I've tried to remove all
"temporary
>object" during the script execution and to perform a garbage collector
...
>But it seems to have no effect ...
>
>Any idea to solve this problem without an exit from R ?
>
>Regards
>
>Isabelle
>
>Isabelle Zabalza-Mezghani
>IFP - Reservoir Engineering Department
>Rueil Malmaison - France
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>https://www.stat.math.ethz.ch/mailman/listinfo/r-help
>  
>

Hi,

running gc() helped me a lot

Regards,
Vladimir

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch
> [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of
> ZABALZA-MEZGHANI Isabelle
> Sent: Wednesday, September 24, 2003 7:27 PM
> To: help R (E-mail)
> Subject: [R] Problem with memory for large datasets
>
>
> Hello,
>
> I would like to know if there is a possibility to "clean" the R
memory
> during a R session. In fact, I realize a lot of instruction with large
> objects (matrix of 500*5000), and I can not manage to achieve the
> end of my
> script due to memory lack. Of course, I've tried to remove all
"temporary
> object" during the script execution and to perform a garbage collector
...
> But it seems to have no effect ...
>
> Any idea to solve this problem without an exit from R ?
>
> Regards
>
> Isabelle
>
> Isabelle Zabalza-Mezghani
> IFP - Reservoir Engineering Department
> Rueil Malmaison - France
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
>
>