Re: [R] Help, please

From: David Winsemius <>
Date: Thu, 19 May 2011 10:40:08 -0400

On May 18, 2011, at 6:29 PM, Julio CÚsar 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

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Received on Thu 19 May 2011 - 14:43:28 GMT

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