Hello everybody,
i wouls like to plot a 2d-curve given aparametrically and color it by using
its curvature function. I've managed to do something similar in 3d plots
(coloring them by height, using this piece of code
cmsel = [colormaps['autumn'](i) for i in sxrange(0,1,0.05)]
S=plot3d(f,(x,-2, 2), (y,-1, 1),adaptive=True, color=cmsel)
show(S, axes=True)
But the same idea doe not work for 3d parametric plots
var('t')
cmsel = [colormaps['autumn'](i) for i in sxrange(0,1,0.05)]
x(t)=cos(t)
y(t) = 3*sin(t)
k(t) =abs(diff(x,t)*diff(y,t,2) - diff(x,t,2)*diff(y,t))/(diff(x,t)^2+
diff(y,t))^(3/2)
C=parametric_plot([cos(t),3*sin(t)], (t,0,2*pi),color=cmsel)
C.show()
gives an error (and in fact I would like to use k(x) as coloring function.
Any suggestion?
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