Add files via upload #1
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The three examples in the mailing list are shown (https://def.fe.up.pt/pipermail/maxima-discuss/2015/051087.html). All the three examples are plotted, but the following appears: "Warning: Cannot set the gnuplot font size without a font name." (The draw package have changed since 2015). I tried to modify Vectorplot function putting wxdraw2d instead of wxdraw2d, but that can not be interpreted (it does not give a plot).