Comment #8 on issue 3038 by [email protected]: sign change in evalf of
complex value as precision is increased
http://code.google.com/p/sympy/issues/detail?id=3038
Just confirming that the issues of comment 2 have been fixed already:
f = 5*sqrt(x) + 5*sqrt(-x + 1) + 5*sqrt(x + 1) - 6*sqrt(5)
jnk, v = solve(f)
r, vcse = cse(v);vcse=vcse[0].subs(reversed(r))
v.n()
0.655814631227503
vcse.n()
0.655814631227503
f.subs(x,v).n(chop=True)
0
f.subs(x,vcse).n(chop=True)
0
sqrt(x).subs(x, v).n(chop=True)
0.809823827278194
sqrt(x).subs(x, vcse).n(chop=True)
0.809823827278194
And using expand(complex=True) when dealing with a complex number
expression can help:
v.count_ops()
44
v.expand(complex=True).count_ops()
19
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