On Mon, 29 Nov 2010, Dan wrote:
<
< Dear All,
<
< The following
<
< 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?
Dan,
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.
What version of Maxima are you using?
Leo
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