def key(c):
'''return, for ax**n+b, +/-root(abs(b/a), b) according to the
apparent sign of the imaginary interval, e.g. if the interval
were (0, 3) the positive root would be returned.
'''
u, f, k = c
r = _root(abs(f.TC() / f.LC()), f.degree())
if u.ay < 0 or u.by < 0:
return -r
return r
def key(c):
'''return, for ax**n+b, +/-root(abs(b/a), b) according to the
apparent sign of the imaginary interval, e.g. if the interval
were (0, 3) the positive root would be returned.
'''
u, f, k = c
r = _root(abs(f.TC()/f.LC()), f.degree())
if u.ay < 0 or u.by < 0:
return -r
return r