Comment #2 on issue 2571 by [email protected]: Regression in Integral.subs
http://code.google.com/p/sympy/issues/detail?id=2571
Nothing involving dummy symbols is changed anymore. If you look at the
integral with the as_dummy() method you can see what variables are "off
limits":
>>> Integral((exp(x*log(x))*log(x)), x).as_dummy()
Integral(exp(_x*log(_x))*log(_x), (_x, x))
You can change `x` but not the `_x` values. You would have to use the
transform method to change the `_x`. Perhaps the integrand should be
changed before the integral is formed? Or else just rebuild it with the
modified integrand. If you start twiddling with what is and is not a valid
target for subs I think you may see other cases show up that would suggest
against it, but YMMV. Perhaps having a fresh set of eyes look at this would
be good.
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