[Maxima] Graphics Question.

[Wilhelm Haager]

> Has anyone tried to use the function "contour_plot()" and increase the
> number of contours created?? The method shown in the HELP file hasn't
> worked for me under XMAXIMA, and I hope to have my Physics students use
> it.
>
>     John
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Hi,

An alternative to the function "contour_plot"
(which is based on the standard graphical routines) would probably be
the function "contourplot" of my control engineering package "COMA"
(which is based on the much more flexible routines of the package "draw",
written by Mario Rodríguez Riotorto).

With the option "contours" you can give a list of the desired
contour levels.

The package "COMA" can presently be found at
    http://www.austromath.at/daten/maxima/zusatz/coma.mac,
the documentation can be found at
    http://www.austromath.at/daten/maxima/zusatz/coma_e.pdf

I have just noticed that the docu contains an error:
    wrong:    contourplot(f(x,y), opts)
    correct:  contourplot(f(x,y),x,y,opts)

Best regards
Wilhelm Haager