gnuplot warning from "demo plot3"

[David Bateman]

There is a gnuplot warning from "demo plot3" that is

octave:1> demo plot3
plot3 example 1:
 z = [0:0.05:5];
 plot3 (cos(2*pi*z), sin(2*pi*z), z, ";helix;");
 plot3 (z, exp(2i*pi*z), ";complex sinusoid;");

  Warning: Single isoline (scan) is not enough for a pm3d plot.
           Hint: Missing blank lines in the data file? See 'help pm3d'
and FAQ.

The issue is that we now have "set pm3d implicit" in __go_draw_axes__.m.
Whereas using pm3d with the Octave "line" objects makes no sense. I
don't see the method of turning off pm3d for lines in gnuplot within the
splot or the "set style" commands. So perhaps we should change back to
"set pm3d explicit" and then explicitly set pm3d mode where needed. Are
there any places where the pm3d style is not specified where it is
needed? Is there a method of turning off pm3d style on an splot by splot
basis?

Regards
David

-- 
David Bateman                                David.Bateman at motorola.com
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