def phi(z):
return 2*sqrt(3+z)
def dif(a,b):
return (phi(a+I*b)-(a+I*b))
var('x y')
plot_vector_field((dif(x,y).real(),dif(x,y).imag()),(x,-3,3),
(y,-3,3)).show()
This returns an error because Maxima does not know: "Is y positive,
negative, or zero?"
I suspect that this is a bug, since plot_vector_field should pass the
necessary information about x and y to Maxima.
Thanks!
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