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Dear all, I was able to find the error. Thought of sharing it, if anyone else comes across the same problem. It turns out that the flirt did not run properly as a result of which the dim4 of my func_data image had been reduced to 1, even though it had successfully transformed the resolution from 4mm to 2mm. It is all working now. Thanks, Shruti On 27 January 2017 at 11:25, Shruti Narasimham <[log in to unmask]> wrote: > Dear all, > > Following from previous conversations, I used the PNAS_Smith09_rsn10.nii > template in my dual regression command (I'm conducting an exploratory > analysis with RSNs in my groups of subjects). > > However, when I used this template instead of my melodic_IC.nii, I got the > following error in dual regression (drC.e files) : > > ols_dof: Error in determining the trace, resorting to basic calculation > /bin/sh: line 1: 9913 Segmentation fault > > I have used flirt to normalize my filtered_func_data files in all the > reg_standard directories (using MNI152_T1_2mm_brain.nii). But I am still > getting this error and therefore not getting any dr output files. > > I am getting no error if I execute the same command with my original filtered_func_data > files and melodic_IC file, but I want to use the PNAS_Smith09_rsn10.nii > template. > > I'd be very grateful if could you please help with what is going wrong > here. > > > Regards, > Shruti >