Dear Robert,
Thank you very much for this function. Is it in cvs already?
Is it possible to plot data with it? I also think that possibility to make
plots for z(i,j),x(i,j),y(i,j), where x,y are coordinates, would make it more
powerfull. Options for style of contour lines may be valuble as well.
all the best
Valery
On Tuesday 02 January 2007 01:41, Robert Dodier wrote:
> 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
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