Dashed and dotted lines (in 3.0.2)

[Fredrik Lingvall]

I'm trying to plot dashed and/or dotted lines in Octave 3.0.2 but it 
don't seem to work.

x=randn(100,1);
plot(x,'k--')

should produce a black dashed line but I only can see a solid line (I'm 
using the Gnuplot backend).

/Fredrik