I get this error when trying the example at:
octave:1> x = -2:0.1:2;
octave:2> [xx,yy] = meshgrid(x,x);
octave:3> z = sin(xx.^2-yy.^2);
error: you must have gnuplot installed to display graphics; if you have gnuplot installed in a non-standard location, see the 'gnuplot_binary' function
I've done an apt-get remove -purge gnuplot octave followed
by a subsequent install and still get the same message. Any thoughts? I'm using Jaunty.
For some reason the reinstall with octave was not installing gnuplot
I tried apt-get install gnuplot and it went through and THOUGHT it was there, but when I did a which gnuplot it didn't show up.
I then went through and apt-cache search | grep gnuplot
and systematically install gnuplot-X11 and python-gnuplot.
I then did a aptitude reinstall gnuplot and things work ...