#### 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.

> This function is obsolete and will be removed from a future version of Octave.