Hi,
Sorry to dredge up an old thread, I was curious about the details on
where randomness is introduced in the following programs (beyond the
normal floating points issues):
> mris_smooth -seed 1234
> mris_sphere -seed 1234
> mris_fix_topology -seed 1234
> mris_ca_label -seed 1234
I assume that the Segonne, Grimson, and Fischl paper on the genetic
algorithm for cortical surface correction applies to mris_fix_topology?
Is it also the case that the randomness is injected in other
min/maximization-type algorithms in the other functions?
> RE: [Freesurfer] variability
> Nick Schmansky
> Thu, 21 Dec 2006 10:14:12 -0800
>
> Valentina,
>
> The randomization in the algorithms accounts for about a 0.02% change
> in thickness results. You can disable randomness (or rather, force
> seeding the rng with same number) by including the flag -norandomness
> with recon-all. This flag is available in v3.0.4.
>
> In older versions, do this to disable randomness: create a file called
> xopts containing this text:
>
> mris_smooth -seed 1234
> mris_sphere -seed 1234
> mris_fix_topology -seed 1234
> mris_ca_label -seed 1234
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