Status: Accepted
Owner: ondrej.certik
Labels: Type-Defect Priority-Medium
New issue 1892 by ondrej.certik: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
In [6]: var("a b")
Out[6]: (a, b)
In [7]: integrate(1/(x*(a+b*x)**3), x)
ERROR: An unexpected erro
Updates:
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Comment #1 on issue 1892 by ondrej.certik: integrate(1/(x*(a+b*x)**3), x)
fails
http://code.google.com/p/sympy/issues/detail?id=1892
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Labels: Integration
Comment #2 on issue 1892 by asmeurer: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
It used to work, before the new polys:
In [1]: var('a b');integrate(1/(x*(a+b*x)**3), x)
Out[1]: (a, b)
Out[1]:
⎛
Updates:
Status: Started
Owner: mattpap
Labels: Polynomial Milestone-Release0.7.0
Comment #3 on issue 1892 by mattpap: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
This is trivial to fix, and I will fix this soon.
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Owner: asmeurer
Comment #4 on issue 1892 by asmeurer: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
This has been fixed in polys9, and I have added a test for this in my
latest WIP branch.
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Blockedon: 2010
Comment #5 on issue 1892 by asmeurer: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
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Comment #6 on issue 1892 by mattpap: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
btw. These are current results from polys11 branch:
In [1]: var('a,b')
Out[1]: (a, b)
In [2]: f = 1/(x*(a+b*x)**3)
In [3]: f
Out[3]:
1
3
Comment #7 on issue 1892 by asmeurer: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
So we really need to be implementing apart in integrate (issue 1280) to
completely fix this.
Anyway, the test is in my branch, so let's leave the issue open, but it
Comment #8 on issue 1892 by matt...@gmail.com: integrate(1/(x*(a+b*x)**3),
x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
It works in master:
In [2]: var('a,b')
Out[2]: (a, b)
In [3]: integrate(1/(x*(a+b*x)**3), x)
Out[3]:
⎛a⎞
- log⎜x + ─⎟ + log(x)
⎝b⎠
Updates:
Labels: NeedsReview asmeurer
Comment #9 on issue 1892 by asmeurer: integrate(1/(x*(a+b*x)**3), x) fails
http://code.google.com/p/sympy/issues/detail?id=1892
My patch from issue 1793 unfortunately makes the output of this a little
more complicated, but it is still correct:
In
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