Hello, to the best of my knowledge, there is not a function
to make contour plots in Maxima. I've attached an attempt.
Here is the comment header.
; contour_plot -- set some parameters for Gnuplot and punt to plot3d
;
; We go to some trouble here to avoid clobbering the Gnuplot preamble
; specified by the user, either as a global option (via set_plot_option)
; or specified in arguments to contour_plot. Just append or prepend
; the parameters for contour plotting to the user-specified preamble.
; Assume that arguments take precedence over global options.
;
; contour_plot knows how to set parameters only for Gnuplot.
; If the plot_format is not a Gnuplot format, complain.
;
; Examples:
;
; contour_plot (x^2 + y^2, [x, -4, 4], [y, -4, 4]);
; contour_plot (sin(y) * cos(x)^2, [x, -4, 4], [y, -4, 4]);
; F(x, y) := x^3 + y^2;
; contour_plot (F, [u, -4, 4], [v, -4, 4]);
; contour_plot (F, [u, -4, 4], [v, -4, 4], [gnuplot_preamble, "set
size ratio -1"]);
; set_plot_option ([gnuplot_preamble, "set cntrparam levels 12"]);
; contour_plot (F, [u, -4, 4], [v, -4, 4]);
; set_plot_option ([plot_format, openmath]);
; contour_plot (F, [u, -4, 4], [v, -4, 4]); => error: must be gnuplot format
; contour_plot (F, [u, -4, 4], [v, -4, 4], [plot_format, gnuplot]);
There is already a function named implicit_plot but it is somewhat
different, I think.
Comments?
Hope this helps,
Robert Dodier