Hugo,
> (%i58) ? plot
>
> 0: (maxima.info)Plotting.
> 1: Definitions for Plotting.
> 2: OPENPLOT_CURVES :Definitions for Plotting.
> 3: PLOT2D :Definitions for Plotting.
> 4: PLOT2D_PS :Definitions for Plotting.
> 5: PLOT3D :Definitions for Plotting.
> 6: PLOT_OPTIONS :Definitions for Plotting.
> 7: SET_PLOT_OPTION :Definitions for Plotting.
Hmm, this looks like old output -- what does build_info(); report?
I suspect you are using Maxima 5.9.1 -- if so, please consider
installing 5.10.0 instead. There have been many improvements
since 5.9.1.
Hope this helps,
Robert Dodier