I fixed it. The step function worked on my server which runs Trusty. I looked at the difference in files, and found that using a file from an older version of octave-control worked.
Specifically, my server had the following aidan@aidan-server:~$ dpkg -l | grep octave-control ii octave-control 2.6.2-1build1 amd64 control functions for Octave from Octave-Forge Comparing the /usr/share/octave/packages/control-2.6.2/@ss/__c2d__.m file from my server (attached) with the /usr/share/octave/packages/control-2.6.5/@ss/__c2d__.m file from my machine $ diff <files> 23c23 < ## Version: 0.5 --- > ## Version: 0.4 30,31c30,34 < [sys.a, tmp] = __sl_mb05nd__ (sys.a, tsam, eps); < sys.b = tmp * sys.b; # G --- > [n, m] = size (sys.b); # n: states, m: inputs > ## TODO: use SLICOT MB05OD > tmp = expm ([sys.a*tsam, sys.b*tsam; zeros(m, n+m)]); > sys.a = tmp (1:n, 1:n); # F > sys.b = tmp (1:n, n+(1:m)); # G Noticing that the older version did not have the offending line, I simply copied the old version over into my system sudo cp ./__c2d__.m.old /usr/share/octave/packages/control-2.6.5/@ss/__c2d__.m And voila! It worked. Enjoy ** Attachment added: "File from octave-control 2.6.2-1build1" https://bugs.launchpad.net/ubuntu/+source/octave-control/+bug/1410542/+attachment/4297978/+files/__c2d__.m.old -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1410542 Title: error: '__sl_mb05nd__' undefined near line 30 column 20 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/octave-control/+bug/1410542/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
