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When I want to compute command (I need it in the pipeline) avscale --allparams mat1 | grep -A 4 "Forward half transform" | tail -n 4 > halfmat1 I get following error "An exception has been thrown Runtime error:- detected by Newmat: matrix is singular MatrixType = Crout # Rows = 3; # Cols = 3 Trace: Crout(lubksb); GeneralSolvI; InvertedMatrix::Evaluate; decompose_aff. terminate called after throwing an instance of 'NEWMAT::SingularException' " Avscale is part of Flirt tool. I use fsl 5.0.8 on a Ubuntu 14.04 64bit. This code is processed without error on MacOs with FSL 5.0.6 on it. I enclosed the mat1 file. I tought that matrix could be bad conditioned, mat1 is a output of command flirt -in $i1 -ref $i2 -omat mat1 where $i1 $i2 preprocessed two longitudinal scans, but this doesn't work on any subjects.