Status: Accepted Owner: ---- Labels: Type-Defect Priority-Medium module-integration
New issue 1277 by fabian.seoane: Exception in trivial integral http://code.google.com/p/sympy/issues/detail?id=1277 In [1]: integrate(n*x**(1/n), (x, 0, S.Half)) Out[1]: 1 1 -1 - - 1 + - n n n*2 n*0 --------- - -------- 1 1 1 + - 1 + - n n but In [2]: integrate(n*(x**(1/n)-1), (x, 0, S.Half)) --------------------------------------------------------------------------- PolynomialError Traceback (most recent call last) /Users/fabian/dev/sympy/<ipython console> in <module>() /Users/fabian/dev/sympy/sympy/utilities/decorator.pyc in threaded_decorator(expr, *args, **kwargs) 53 return Add(*[ func(f, *args, **kwargs) for f in expr.args ]) 54 else: ---> 55 return func(expr, *args, **kwargs) 56 57 threaded_decorator.__doc__ = func.__doc__ /Users/fabian/dev/sympy/sympy/integrals/integrals.pyc in integrate(*args, **kwargs) 380 381 if isinstance(integral, Integral): --> 382 return integral.doit() 383 else: 384 return integral /Users/fabian/dev/sympy/sympy/integrals/integrals.pyc in doit(self, **hints) 130 131 for x,ab in self.limits: --> 132 antideriv = self._eval_integral(function, x) 133 134 if antideriv is None: /Users/fabian/dev/sympy/sympy/integrals/integrals.pyc in _eval_integral(self, f, x) 304 305 # fall back to the more general algorithm --> 306 h = heurisch(g, x, hints=[]) 307 308 if h is not None: /Users/fabian/dev/sympy/sympy/integrals/risch.pyc in heurisch(f, x, **kwargs) 214 215 denoms = [ g.as_numer_denom()[1] for g in diffs ] --> 216 denom = reduce(lambda p, q: lcm(p, q, V), denoms) 217 218 numers = [ Poly.cancel(denom * g, *V) for g in diffs ] /Users/fabian/dev/sympy/sympy/integrals/risch.pyc in <lambda>(p, q) 214 215 denoms = [ g.as_numer_denom()[1] for g in diffs ] --> 216 denom = reduce(lambda p, q: lcm(p, q, V), denoms) 217 218 numers = [ Poly.cancel(denom * g, *V) for g in diffs ] /Users/fabian/dev/sympy/sympy/polys/wrappers.pyc in lcm(*args, **kwargs) /Users/fabian/dev/sympy/sympy/polys/wrappers.pyc in _map_basic(f, n, *args, **kwargs) 37 38 def _map_basic(f, n, *args, **kwargs): ---> 39 result = f(*_conv_args(n, args), **kwargs) 40 41 if isinstance(result, (list, tuple, set)): /Users/fabian/dev/sympy/sympy/polys/algorithms.pyc in poly_lcm(f, g, *symbols) 352 raise SymbolsError("Redundant symbols were given") 353 --> 354 f, g = f.unify_with(g) 355 356 symbols, flags = f.symbols, f.flags /Users/fabian/dev/sympy/sympy/polys/polynomial.pyc in unify_with(self, other) 1510 self = cls(self, *symbols, **flags) 1511 -> 1512 other = cls(other, *symbols, **flags) 1513 1514 return self, other /Users/fabian/dev/sympy/sympy/polys/polynomial.pyc in __new__(cls, poly, *symbols, **flags) 398 terms = Poly._permute(poly, *symbols) 399 else: --> 400 terms = Poly._decompose(poly, *symbols) 401 402 if terms: /Users/fabian/dev/sympy/sympy/polys/polynomial.pyc in _decompose(poly, *symbols) 541 continue 542 --> 543 raise PolynomialError("Can't decompose %s" % factor) 544 else: 545 coeff *= factor PolynomialError: Can't decompose _x0**(2 - 1/n) -- You received this message because you are listed in the owner or CC fields of this issue, or because you starred this issue. You may adjust your issue notification preferences at: http://code.google.com/hosting/settings --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-issues@googlegroups.com To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en -~----------~----~----~----~------~----~------~--~---
