Updates:
Status: Fixed
Comment #7 on issue 847 by [email protected]: sign for complex numbers
http://code.google.com/p/sympy/issues/detail?id=847
The signum function is z/abs(z); when z is complex a complex sign is
returned:
sign(I-2).n(3)
-0.894 + 0.447*I
It will always be true that if a, b = sign(z).as_real_imag() then a**2 +
b**2 = 1.
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