[R] how to make simulation faster

[stats12]

Thank you very much for saving my time. I ran 500 simulations in 20 min using
"sapply" function. I'll try "data.table" method for the rest of my
simulations to get the results even faster. Thanks a lot again!



jholtman wrote
> You can get even better improvement using the 'data.table' package:
> 
>> require(data.table)
>> system.time({
> +     dt <- data.table(value = x, z = z)
> +     r3 <- dt[
> +             , list(sum = sum(value))
> +             , keyby = z
> +             ]
> + })
>    user  system elapsed
>    0.14    0.00    0.14
> 
> 
> On Thu, Oct 25, 2012 at 11:23 PM, stats12 <

> skarmv@

> > wrote:
>> Dear R users,
>>
>> I need to run 1000 simulations to find maximum likelihood estimates.  I
>> print my output as a vector. However, it is taking too long. I am running
>> 50
>> simulations at a time and it is taking me 30 minutes. Once I tried to run
>> 200 simulations at once, after 2 hours I stopped it and saw that only
>> about
>> 40 of them are simulated in those 2 hours. Is there any way to make my
>> simulations faster? (I can post my code if needed, I'm just looking for
>> general ideas here). Thank you in advance.
>>
>>
>>
>> --
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>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
>> 

> R-help@

>  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.
> 
> 
> 
> -- 
> Jim Holtman
> Data Munger Guru
> 
> What is the problem that you are trying to solve?
> Tell me what you want to do, not how you want to do it.
> 
> ______________________________________________

> R-help@

>  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.





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