[R] skip lapply item for conditions(RAM, execution time)

[Joachim Harloff]

Thank you,

but: 
- How do I create a condition object watching for memory overflow? Or, alternatively, excess time?
- How do I tell R to end the current lapply item, clean up memory and proceed to the next item? (I know I can write a wrapper function including gc() and direct lapply to that wrapper function. But what do I do to stop ONLY the original function, not the whole R process?)


Joachim

> ?tryCatch   
> 
> Bert Gunter
> Genentech Nonclinical Biostatistics
>  
>  
> 
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] 
> On
> Behalf Of Joachim Harloff
> Sent: Wednesday, February 17, 2010 7:00 AM
> To: r-help at r-project.org
> Subject: [R] skip lapply item for conditions(RAM, execution time)
> 
> Hi,
> 
> I use lapply with a function from a package, and every 20th to 50th 
> function
> execution (out of 500 to 10 000 times) fails for some unknown reason. 
> RAM
> consumption ever increases (out of limit) and execution time is endless. 
> I
> am not going to debug the package. (I rather feel like an end-user.)
> 
> If it was Java, I'd wrap the function in a try...catch statement like 
> about
> 
> try{
>     for(i=1;i<=10000;i++){
>         dofunction(i);
>         }
>     }
> catch(outofmemoryexception e){
>     kill(dofunctioninstance);
>     gc();
>     next;
>     }
> 
> 
> I did not find out how to construct this in R. Is anyone so kind to 
> point me
> to a documentation more exhaustive than help(conditions)? Or otherwise
> provide a snippet of R code?
> 
> Regards, Joachim
> 
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