[R] Help, please

[David Winsemius]

On May 18, 2011, at 6:29 PM, Julio César Flores Castro wrote:

> Hi,
>
> I am using R 2.10.1 and I have a doubt. Do you know how many cases  
> can R
> handle?

I was able to handle (meaning do Cox proportional hazards work with  
the 'rms' package which adds extra memory overhead with a datadist  
object)  a 5.5 million rows by 100 columns dataframe without  
difficulty using 24 GB on a Mac (BSD UNIX kernel). I was running into  
performance slow downs related to paging out to virtual memory at 150  
columns, but after expanding to 32 GB can now handle 5.5 MM records  
with 200 columns without paging.

>
> I want to use the library npmc but if I have more than 4,500 cases I  
> get an
> error message. If I use less than 4500 cases I don´t have problems  
> with this
> library.
>
> Is there any way to increase the number of cases in order to use this
> library.

64 bit OS, 64 bit R,  and more memory.

-- 
David Winsemius, MD
West Hartford, CT