gnuplot - Octave plotting error

Question

I am new to octave, I just tried my first plotting with Octave 3.4.0 when I get the following error. Any help will be much appreciated. The gnuplot version is 4.6

     octave-3.4.0:3> x=1:1:20;
     octave-3.4.0:4> y=sin(x);
     octave-3.4.0:5> plot(x,y)

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

The terminal window I am using for octave is the mac X-terminal.

Answer 1

Ok, I found the solution to this problem. Just run:

setenv("GNUTERM","X11")

Before you plot anything, e.g.,

plot(x,y)