The fact that you have allocated it 5GB of new memory suggests that you may
in fact be hitting the 3GB limit that was characteristic of Win32/x86.  Is
there a way to check that your R process is free to use all of the
non-kernel memory?  Some setting in the BIOS that might be preventing you
from using PAE calls, or that sort of thing?  It's the only obvious thing
to check IMHO, since you said you're using 64 bit R on 64 bit Windows.  I
haven't had to administer a Windows box in ages so forgive me for not
remembering the right incantation; it's just that I've hit this sort of a
wall in the past, too.

Can you post a sessionInfo() dump from inside R, just to be sure that
everything is compiled right?

You might also want to cross-post your query to R-help (with said
sessionInfo() output included).
I once had an embarrassingly simple problem that I could not solve, and
Simon Urbanek just fixed it.
But, if you are going to post there, be sure and provide sessionInfo().  A
common theme.

Hope this helps,
--t

On Sat, Mar 3, 2012 at 9:06 AM, Salwa Eid <salwaeid@hotmail.com> wrote:

>
>
>
>
> Dear all,    Have been trying to use random forest for classification and
> i keep getting the error cannot allocate vector size of 1.8 Gb.  I am
> working on R 64 bits under windows 64 bits.   I had a 3gb ram and then
> upgraded it to 8 to try to solve the problem.  But still not working and
> have the same error.  Any help? Regards,salwa
>        [[alternative HTML version deleted]]
>
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>



-- 
*A model is a lie that helps you see the truth.*
*
*
Howard Skipper<http://cancerres.aacrjournals.org/content/31/9/1173.full.pdf>

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