On 19 Aug 2017, at 22:54, Francesco Sammartino <[log in to unmask]> wrote:

Hi 

I used probtrackx2 to perform tractography from the subthalamic nucleus to 6 cortical areas with the omatrix1 option and a waypoint through the thalamus (thalamus as a whole mask - wyapoint 'AND'). Result: I am not able to perform clustering with Kmeans anymore following the instructions reported at https://fsl.fmrib.ox.ac.uk/fsl/fslwiki/FDT/UserGuide

I get this error:

Warning: Ignoring rows of X with missing data. 

> In kmeans (line 164) 

Error using kmeans (line 269)

X must have more rows than the number of clusters.

The number of targetmasks is set to 6 so I have 6 clusters for Kmeans. The curious thing is that without waypoint it was working fine...

thanks a lot