Comment 4 for bug 1020796

A workaround is to add option persist (octave -q --persist "%f") to the execute command for octave in build menu commands dialog (@ref http://www.geany.org/manual/current/index.html#build-menu-commands-dialog) so octave won't terminate itself.

As you should terminate octave by hand after finishing execution also consider not to use the geany VTE Terminal
(@ref http://www.geany.org/manual/current/index.html#terminal-vte-preferences)