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Comment #9 on issue 3658 by [email protected]: hydrogen.py very slow
http://code.google.com/p/sympy/issues/detail?id=3658
It does do useful computation. It shows that when the integral i is
evaluated it evaluates to 0. It is important that the example use the code
and not just print out the result.
This is a very strange bug.
These are fast
i = Integral(R_nl(1, 0, 1, r)**2 * r**2, (r, 0, oo))
ii = i.doit()
This is slow
Eq(i, ii)
The slow part must be inside the Relational call. A good approach would be
to go through that code with the inputs i and ii above step by step and see
which line causes the slowdown.
This is an important problem.
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