In Sage's contour plots, the default colors shade from black to white.
This applies to both the shades used to fill and the actual color of the
contour lines. If you turn off the fill color, the highest contour will be
white-on-white, and thus invisible. Here's an example (notice the label
floating apparently in the middle of nowhere):
x,y = var('x,y')
pl = contour_plot(-10*(x^2+y^2), (x,-1,1), (y,-1,1), fill = False, labels =
True, label_fontsize = 13).show()
You can fix this by making all the contour lines black. The keyword
cmap=[(0,0,0)] worked for me.
Can we change the defaults so that fill=False does not default to
white-on-white? Or add a keyword that will make all contour lines the same
color? Or at least add an example about this to the documentation?
--Ursula.
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