Updates:
Labels: -NeedsReview NeedsBetterPatch
Comment #10 on issue 1680 by Vinzent.Steinberg: Infinite recursion in cos
(and other trigonometric functions)
http://code.google.com/p/sympy/issues/detail?id=1680
Thank you a lot for investigating this!
Two comments concerning coding style:
Please make sure to always use
x = value
instead of
x=value
(except for keyword arguments).
Please use
raise Error('message')
instead of the deprecated
raise Error, 'message'
When running the tests I get these failures:
________________________________________________________________________________
_
sympy/functions/elementary/tests/test_piecewise.py:test_piecewise_integrate
__
File "/home/one/src/sympy/sympy/functions/elementary/tests/test_piecewise.py",
line
82, in test_piecewise_integrate
assert integrate(g, (x, -2, 2)) == Rational(14, 3)
File "/home/one/src/sympy/sympy/utilities/decorator.py", line 56, in
threaded_decorator
return func(expr, *args, **kwargs)
File "/home/one/src/sympy/sympy/integrals/integrals.py", line 512, in
integrate
return integral.doit(deep = False)
File "/home/one/src/sympy/sympy/integrals/integrals.py", line 155, in doit
antideriv = self._eval_integral(function, x)
File "/home/one/src/sympy/sympy/integrals/integrals.py", line 275, in
_eval_integral
return f._eval_integral(x)
File "/home/one/src/sympy/sympy/functions/elementary/piecewise.py", line
156, in
_eval_integral
adduend = limit(v,x,range.end,dir="-")
File "/home/one/src/sympy/sympy/series/limits.py", line 91, in limit
r = gruntz(e, z, z0, dir)
File "/home/one/src/sympy/sympy/series/gruntz.py", line 509, in gruntz
return limitinf(e0, x)
File "/home/one/src/sympy/sympy/series/gruntz.py", line 339, in limitinf
c0, e0 = mrv_leadterm(e,x)
File "/home/one/src/sympy/sympy/series/gruntz.py", line 391, in
mrv_leadterm
Omega = mrv(e,x)
File "/home/one/src/sympy/sympy/series/gruntz.py", line 227, in mrv
raise NotImplementedError("Functions with more arguments: '%s'" % e)
NotImplementedError: Functions with more arguments: 'Piecewise((4 - 1/_x, 4
- 1/_x <
0), (16 - 4/_x - 2*(4 - 1/_x)**2 + (4 - 1/_x)**3/3, 0 <= 4 - 1/_x))'
________________________________________________________________________________
____ sympy/functions/elementary/tests/test_piecewise.py:test_piecewise_fold
____
File "/home/one/src/sympy/sympy/functions/elementary/tests/test_piecewise.py",
line
143, in test_piecewise_fold
assert integrate(piecewise_fold(p),(x,-oo,oo)) == integrate(2*x + 2,
(x, 0, 1))
File "/home/one/src/sympy/sympy/utilities/decorator.py", line 56, in
threaded_decorator
return func(expr, *args, **kwargs)
File "/home/one/src/sympy/sympy/integrals/integrals.py", line 512, in
integrate
return integral.doit(deep = False)
File "/home/one/src/sympy/sympy/integrals/integrals.py", line 155, in doit
antideriv = self._eval_integral(function, x)
File "/home/one/src/sympy/sympy/integrals/integrals.py", line 275, in
_eval_integral
return f._eval_integral(x)
File "/home/one/src/sympy/sympy/functions/elementary/piecewise.py", line
156, in
_eval_integral
adduend = limit(v,x,range.end,dir="-")
File "/home/one/src/sympy/sympy/series/limits.py", line 91, in limit
r = gruntz(e, z, z0, dir)
File "/home/one/src/sympy/sympy/series/gruntz.py", line 509, in gruntz
return limitinf(e0, x)
File "/home/one/src/sympy/sympy/series/gruntz.py", line 339, in limitinf
c0, e0 = mrv_leadterm(e,x)
File "/home/one/src/sympy/sympy/series/gruntz.py", line 391, in
mrv_leadterm
Omega = mrv(e,x)
File "/home/one/src/sympy/sympy/series/gruntz.py", line 227, in mrv
raise NotImplementedError("Functions with more arguments: '%s'" % e)
NotImplementedError: Functions with more arguments: 'Piecewise((0, -1/_x <
0), (-2/_x
- 1/_x**2, And(0 <= -1/_x, -1/_x <= 1)), (1, 1 < -1/_x))'
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