how to do contour plot using log scales

• Subject: how to do contour plot using log scales
• From: -
• Date: Tue, 29 Oct 2013 15:14:10 +0000

Dear all,

I have a problem with plotting a contour figure with x and y both using log
scales.

I have tried:

1)

contour_plot (u^3 + v^2, [u, -4, 4], [v, -4, 4], [gnuplot_preamble, "set
cntrparam levels 12"], [logx], [logy])$

and

2)

load(draw)$

draw3d(logx=true, logy=true, explicit(20*exp(-x^2-y^2)-10,x,0,2,y,-3,3),
contour_levels = 15, contour = map, surface_hide = true)$

And found neither 1) nor 2) works.

Anyone know how to do the plot?

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