It seems that plot_vector_field3d does not handle exceptions in a
convenient way:
For example,
var('x,y,z'); H = (-y/(x^2+y^2), x/(x^2+y^2), 0);
plot_vector_field3d(H, (-4,4), (-4,4), (-4,4))
will not produce the plot while
plot_vector_field3d(H, (-3,4), (-3,4), (-3,4))
will produce the plot. I suspect the domain symmetric about 0 causes
the SAGE to compute the vector fields on its singularities.
Is there a simple way to force SAGE to ignore those points where the
vector field is undefined?
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