Mark Dickinson added the comment:
I don't see a real problem here: both cmath.sqrt(-1) and (-1)**0.5 are
producing good approximations to the correct result, which is about as much as
you can hope for in general with floating-point algorithms.
I wouldn't want to start special-casing the comp
STINNER Victor added the comment:
(-1)**.5 is the same than complex(-1,0)**.5, but it is computed differently
than cmath.sqrt(-1).
-1.**0.5 computes:
vabs = math.hypot(-1, 0)
len = pow(vabs, 0.5)
at = math.atan2(0, -1)
phase = at * 0.5
return complex(len*math.cos(phase), len*math.si
New submission from João Bernardo :
With Python 3, the ** operator is supposed to do math with complex numbers, but
look what is happening:
Python 3.2 (r32:88445, Feb 20 2011, 21:30:00) [MSC v.1500 64 bit (AMD64)] on
win32
Type "copyright", "credits" or "license()" for more information.
>>> (-
