Hi - This error occurs in voxels where the b=0 is very small (~1e-6).  If you change your brain mask to only contain b=0 values above some threshold, you should be able to run DTIFIT fine. 

For example:

fslroi data nodif 0 1

fslmaths nodif -thr 10 -bin -mas nodif_brain_mask.nii newmask

Hopefully we should be able to fix this in future releases.

Cheers,

Saad

On 10 Oct 2016, at 14:18, Ana Maria Escorza <[log in to unmask]> wrote:

I did

2016-10-10 14:09 GMT+02:00 Saad Jbabdi <[log in to unmask]>:

Hi -thanks.  could you upload your data using this link: https://oxfile.ox.ac.uk/oxfile/work/extBox?id=38233523EDFBBDF4A7

so that I can try to replicate your error. 

Cheers,

Saad

On 10 Oct 2016, at 11:51, Ana Maria Escorza <[log in to unmask]> wrote:

Of course, thanks.

2016-10-10 12:48 GMT+02:00 Saad Jbabdi <[log in to unmask]>:

Hi - could you attach your bvals/bvecs file?

Cheers,
Saad

> On 10 Oct 2016, at 10:33, Ana E. <[log in to unmask]> wrote:
>
> Hello,
>
> When I use dtifit without the option --wls, I don't obtain error.
>
> But when I use the same command but add the --wls option, I obtain the following error:
>
> Terminate called after throwing an instance of 'NEWMAT::SingularException'
>
>
> Could someone help me? any ideas?

<20111214_130020WIPDTIL64Db1500SENSEMOLINAPORRASEMILIOs401a1004.bval><correct.eddy_rotated_bvecs>