Hi, I am having a similar problem to the original poster. I get the error:
Requested tolerance was 0.001, and achieved tolerance was nan
and I get this error repeatedly (not surprising, if fnirt is 'tuning' based
on each previous iteration). Then it exits with:
Error occured during estimation at subsampling level > 1
Exception thrown with message: SpMat::DiagPrecond: Cannot condition singular
matrix
so far I have gotten this identical error with every setup I have tried.
Right now I am just trying to register a simple T1 image to the supplied
MNI152 2mm template, using the supplied config file. I've also tried it
without the config file and get identical results. I'm not really sure how
to debug from here. I am using fsl-4.1.4.
Thanks in advance for any help.
-John
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