On Fri, Apr 6, 2012 at 4:05 AM, Knut J Bjuland <knut...@hotmail.com> wrote:
> I used recon-all on two different system one with Ubuntu 11.10 and a > cluster with Centos 5.7. When I compare the recon-all of these two > recon-all run I see that there is a small difference. Is this difference > caused by difference in math libraries, and difference in the way > floating point is handle? Is there any way to get around this problem > and get Freesurfer to behave is similar way on Centos 5.7 system as it > did on the Ubuntu 11.10. If it's exactly the same version of Freesurfer on both platforms, then a difference in the maths libraries would be a highly likely explanation. And it's possible that the library on one platform has a bug which the other doesn't (or even that each version has a different set of bugs). However, may I make a suggestion: rather than look for a way to make the two runs identical, why not use the difference as an estimate of the experimental error in a Freesurfer run? If any conclusions you draw are robust against the change in platform, you can have extra confidence in them (and even note that in any paper you write up). Regards, Richard _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
