The limit for the amount of memory that a 32 bit machine can use for one
process is 2^32 bytes. Encoding only one of the matrices used for computing
temporal autocorrelations requires (25*2*184)^2*8 bytes, and there are
several other large matrices used. There simply isn't the memory for doing a
fixed effects analysis of this scale. I would suggest doing a random effects
analysis instead. See Chapter 12 of
http://www.fil.ion.ucl.ac.uk/spm/doc/books/hbf2/
Best regards,
-John
On Wednesday 09 April 2008 12:32, pachito loayza wrote:
> I'm triying to perform a Fixed Efects Analysis in 25 subjects and 2
> sessions of 184 scans for each subject. The computer is able to do it when
> using the "fMRI model especification", but when using the "Model
> Estimation", Matlab reports the error "Out of Memory" I have increased the
> virtual memory way beyond the theoretical requirements. Does anybody know
> how to fix this problem?
> I would apreciate any help
>
> thank you very much
>
> francis.
>
> Next are the features of the server that I'm using.
>
> OS: Windows 2003 server
> Matlab version: 7.3 R2006beta
>
>
> feature memstats
>
>
> Physical Memory (RAM):
> In Use: 1142 MB (4763e000)
> Free: 2952 MB (b88be000)
> Total: 4094 MB (ffefc000)
> Page File (Swap space):
> In Use: 942 MB (3ae37000)
> Free: 10985 MB (2ae976000)
> Total: 11927 MB (2e97ad000)
> Virtual Memory (Address Space):
> In Use: 404 MB (1944d000)
> Free: 1643 MB (66b93000)
> Total: 2047 MB (7ffe0000)
> Largest Contiguous Free Blocks:
> 1. [at 174a0000] 1150 MB (47e30000)
> 2. [at 5fa76000] 215 MB ( d74a000)
> 3. [at 6d1e3000] 72 MB ( 485d000)
> 4. [at 744e0000] 25 MB ( 1920000)
> 5. [at 7e02f000] 22 MB ( 16c1000)
> 6. [at 71b67000] 19 MB ( 13e9000)
> 7. [at 79e5e000] 16 MB ( 1022000)
> 8. [at 7d0d8000] 15 MB ( f48000)
> 9. [at 72f77000] 12 MB ( cd9000)
> 10. [at 7ae89000] 10 MB ( af7000)
> ======= ==========
> 1560 MB (618db000)
>
> ans =
>
> 1.2061e+009
>
>
>
>
>
>
>
>
>
> _________________________________________________________________
> Discover the new Windows Vista
> http://search.msn.com/results.aspx?q=windows+vista&mkt=en-US&form=QBRE
|