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Issue 3223:degree((x+1)**10000) takes too long #1793

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Issue 3223:degree((x+1)**10000) takes too long #1793

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4522443
Issue 3223 fixed
hargup Feb 16, 2013
7fee1c0
Errors in previous commit fixed.
hargup Feb 16, 2013
1c8b3c3
Update sympy/polys/polytools.py
hargup Feb 18, 2013
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Issue 3223 fixed 
https://code.google.com/p/sympy/issues/detail?id=3223
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@hargup
hargup committed Feb 16, 2013
commit 45224436396751a619e5b52720de16f0bc75f3d4
16 changes: 14 additions & 2 deletions sympy/polys/polytools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1692,7 +1692,7 @@ def degree(f, gen=0):

"""
j = f._gen_to_level(gen)

if hasattr(f.rep, 'degree'):
return f.rep.degree(j)
else: # pragma: no cover
Expand Down Expand Up @@ -3953,8 +3953,20 @@ def degree(f, *gens, **args):
1

"""
options.allowed_flags(args, ['gen', 'polys'])
if len(gens)==0:
gens_present=False
else:
gens_present=True

if f.is_polynomial():
for sym in f.free_symbols:
if gens_present:
if sym==gens[0]:
return -f.subs(sym,1/sym).leadterm(sym)[1]
else:
return -f.subs(sym,1/sym).leadterm(sym)[1]

options.allowed_flags(args, ['gen', 'polys'])
try:
F, opt = poly_from_expr(f, *gens, **args)
except PolificationFailed, exc:
Expand Down