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15.2.7 Interaction with gnuplot

— Loadable Function: val = gnuplot_binary ()
— Loadable Function: old_val = gnuplot_binary (new_val)

Query or set the name of the program invoked by the plot command. The default value "gnuplot". See Installation.

— Loadable Function: val = gnuplot_use_title_option ()
— Loadable Function: old_val = gnuplot_use_title_option (new_val)

If enabled, append `-title "Figure NN"' to the gnuplot command. By default, this feature is enabled if the DISPLAY environment variable is set when Octave starts.