Comment #1 on issue 2630 by asmeurer: DeltaIntegrate provides wrong answer
on Multivariable integrals
http://code.google.com/p/sympy/issues/detail?id=2630
If something is now a problem but didn't used to be, you can use the git
bisect command to find the exact commit that broke it. This is very
useful, because it shows exactly the change that caused the problem, the
author, and the motivation (here you start to see the benefit of writing
good commit messages). So please do this, and post here the commit that it
finds. You just type
git checkout master
git bisect start
git bisect bad # mark master as "bad"
git checkout <some earlier commit where it worked> # an easy way to do this
is to use tagged commits, like sympy-version-number, like sympy-0.7.0
# Check that it is indeed working
git bisect good # Mark it as good
# Now it will bisect between these two commits. Continually check if it
works or doesn't and type "git bisect good/bad" accordingly until it tells
you what the first bad commit was. If you come to a commit that doesn't
work for some reason, you can type "git bisect skip" to skip it (though you
should know that if you get some strange import error, you need to clean
your .pyc files using py.cleanup, which requires the py module).
See also "git help bisect".
Oh, and when you're done, "git bisect reset" will stop the bisect process
and take you back to master.
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