Updates:
Status: Fixed
Comment #15 on issue 1893 by ness...@gmail.com: integrate(log(x) * x**(k-1)
* exp(-x) / gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
A test for this was commited to master.
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Comment #14 on issue 1893 by ness...@gmail.com: integrate(log(x) * x**(k-1)
* exp(-x) / gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
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Comment #12 on issue 1893 by ness...@googlemail.com: integrate(log(x) *
x**(k-1) * exp(-x) / gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
Hm. Combsimp is definitely not idempotent (should it be?):
[I fear this is not going to be very readable...]
In [1]:
Comment #13 on issue 1893 by asmeurer: integrate(log(x) * x**(k-1) *
exp(-x) / gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
Hm. Combsimp is definitely not idempotent (should it be?):
Perhaps not, if it's too difficult to make it so. But we should
Updates:
Labels: NeedsReview ness987
Comment #9 on issue 1893 by ness...@googlemail.com: integrate(log(x) *
x**(k-1) * exp(-x) / gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
This mostly works in gsoc-3 (https://github.com/sympy/sympy/pull/543):
In
Comment #10 on issue 1893 by ness...@googlemail.com: integrate(log(x) *
x**(k-1) * exp(-x) / gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
This mostly works in gsoc-3 (https://github.com/sympy/sympy/pull/543):
In [78]: a = Symbol('a', positive=True)
In
Comment #11 on issue 1893 by asmeurer: integrate(log(x) * x**(k-1) *
exp(-x) / gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
So combsimp() isn't being called in the right order, or it's just not
working?
I deleted your duplicate comment.
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Comment #3 on issue 1893 by asmeurer: integrate(log(x) * x**(k-1) * exp(-x)
/ gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
Yes. If you just do x (no limits), Maple returns the integral unevaluated.
It doesn't look like limit can handle unevaluated
Comment #4 on issue 1893 by mattpap: integrate(log(x) * x**(k-1) * exp(-x)
/ gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
Things like x**k can't be handled by heuristic Risch algorithm, I'm sure
that also by
the recursive version. This is a case where
Comment #5 on issue 1893 by mattpap: integrate(log(x) * x**(k-1) * exp(-x)
/ gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
Here is what Mathematica gives for the indefinite integral:
In[1]:= Integrate[x^(k-1)*Exp[-x]*Log[x], x]
k
Out[1]= (-(x
Updates:
Summary: integrate(log(x) * x**(k-1) * exp(-x) / gamma(k), (x, 0, oo))
hangs
Labels: Integration
Comment #1 on issue 1893 by asmeurer: integrate(log(x) * x**(k-1) * exp(-x)
/ gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
The indefinite
Comment #2 on issue 1893 by mierle: integrate(log(x) * x**(k-1) * exp(-x) /
gamma(k), (x, 0, oo)) hangs
http://code.google.com/p/sympy/issues/detail?id=1893
But Wolfram's integration engine seems to handle it. Do you mean the
definite integral
can't be computed?
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