error

gnuplot> set terminal aqua enhanced title "Figure 2" size 560 420 font "*,6" dashlength 1
^
line 0: unknown or ambiguous terminal type; type just 'set terminal' for a list

solution

setenv("GNUTERM","qt")

ref

http://stackoverflow.com/questions/22898609/octave-does-not-plot

reflection

• The problem seems to come from CLI.