On Tue, 30 Nov 2010, Leo Butler wrote:
> < f(x,y) := x^2+y^2-1 ;
> < contour_plot(f(x,y),[x,-1.5,1.5],[y,-1.5,1.5],[gnuplot_preamble, "set
> < cntrparam levels discrete 0.0"]) ;
> < produces a nice-looking plot of the unit circle. However, if I thn
> < decide I want the (x,y) values on the contour in a
> < whitespace-separated table and issue
> <
> < contour_plot(f(x,y),[x,-1.5,1.5],[y,-1.5,1.5],[gnuplot_preamble, "set table
> < 'circletable.dat'; set cntrparam levels discrete 0.0"]) ;
> < the file circletable.dat is created, but is empty. Any ideas, please?
> When I run the command above, the file is created and filled.
> I'm using Maxima 5.22.1 and Gnuplot 4.4.0 on Debian testing.
Thanks again Leo. Have now upgraded Gnuplot to 4.4 patchlevel 2
(Gentoo revision r0), and I too get nicely-populated files.
--
Regards,
Dan