set_plot_option



Hi,


When I try to use :
set_plot_option(['t,-%pi,%pi]);
or
set_plot_option([t,-%pi,%pi]);
I got the same  error :
(%i211) set_plot_option(['t,-%pi,%pi]);
-%pi is not of the right type in t list
 -- an error.  To debug this try debugmode(true);

I must use :

set_plot_option([gnuplot_preamble, "set trange [-pi:pi]"])$

Why ?

Adam