[Freesurfer] "MATLAB: Undefined variable" error, FSFAST Tutorial, using Octave

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Dear Freesurfer Developers,

I am running into a "MATLAB: Undefined variable" error while doing the FSFAST tutorial, using Ubuntu 18.04, Freesurfer v6, and Octave***. I did try a few solutions posted already (please see links below), but I still cannot successfully run the tutorial command line.

.basrc additions for Octave environment variables

(Ref: https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg21241.html):

export FS_OCTAVE_LIB=/usr/bin/octave export FS_OCTAVE_LIB=/usr/bin/octave

additional command line:

export FS_USE_OCTAVE=1

Ref: https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg60448.html

main command line:

mkcontrast-sess -analysis my-workmem.sm05.lh -contrast encode-v-base -a 1

(tutorial page: https://surfer.nmr.mgh.harvard.edu/fswiki/FsFastTutorialV6.0/FsFastFirstLeve... )

error output:

INFO: Found 5 Non-Null Conditions INFO: Found 1 Delays Condition Weights: 1.00000000000000000000 0 0 0 0 mkcontrast2 -config my-workmem.sm05.lh/encode-v-base.config -anadir my-workmem.sm05.lh -wcond 1.00000000000000000000 0 0 0 0 -sumconds -o my-workmem.sm05.lh/encode-v-base.mat -wdelay 1 -octave $Id: mkcontrast2,v 1.3 2016/03/11 23:46:48 greve Exp $ cmtxfile my-workmem.sm05.lh/encode-v-base.mat nconds 5, wcond 1.00000000000000000000 0 0 0 0 ndelays 1, wdelay 1 ndelays 1, wpsa sumconds 1 sumdelays 0 nircorr 0 TER 0.050000 rdelta rtau cmtxfile my-workmem.sm05.lh/encode-v-base.mat monly 0 NCond 5 WCond 1.00000000000000000000 0 0 0 0 NDelay 1 WDelay 1 TER 0.050000 sumconds 1 sumdelays 0 nircorr 0 TPreStim 0 RmPreStim 0 rdelta 0 0 rtau 0 0 ndelays 1 CNorm 1 setwdelay 0 setwcond 0 Matlab file is /tmp/mkcontrast2.18977.m MATLAB: Undefined variable. ERROR running mkcontrast mkcontrast2 -config my-workmem.sm05.lh/encode-v-base.config -anadir my-workmem.sm05.lh -wcond 1.00000000000000000000 0 0 0 0 -sumconds -o my-workmem.sm05.lh/encode-v-base.mat -wdelay 1 -octave Tue May 28 16:51:41 EDT 2019

I also modified the mkcontrast freesurfer file according to this post:

Ref: https://www.mail-archive.com/freesurfer@nmr.mgh.harvard.edu/msg58758.html

Thank you for your assistance!

Regards,

Zach

Zacharie Saint-Georges Research Assistant Royal Ottawa Institute for Mental Health Research Zacharie.Saint-Georges@TheRoyal.ca