Comment #14 on issue 2571 by [email protected]: Regression in Integral.subs
http://code.google.com/p/sympy/issues/detail?id=2571
Just a footnote here: xreplace is now available
Integral((exp(x*log(x))*log(x)), x).xreplace({exp(x*log(x)): x**x})
Integral(x**x*log(x), x)
With it, you can shoot yourself in the foot (but it'll take care of the OP
issue):
Integral((exp(x*log(x))*log(x)), x).xreplace({x: 5})
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\core\basic.py", line 903, in xreplace
return self.func(*args)
File "sympy\integrals\integrals.py", line 77, in __new__
limits, sign = _process_limits(*symbols)
File "sympy\integrals\integrals.py", line 57, in _process_limits
raise ValueError('Invalid limits given: %s' % str(symbols))
ValueError: Invalid limits given: ((5,),)
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