Comment #3 on issue 2630 by [email protected]: DeltaIntegrate provides
wrong answer on Multivariable integrals
http://code.google.com/p/sympy/issues/detail?id=2630
I can go back pretty far and this is still an issue. I don't think it was
ever working properly.
A simpler fail-case (courtesy of Tom)
integrate(exp(-x)*deltafunctions.DiracDelta(10*x-10-y), (x, -oo, oo))
exp(-1 - y/10)
Should be 1/10 * exp(-1 - y/10)
The simpler version (without the y) gives the correct answer today but
doesn't a year ago. Does bisect work in reverse?
integrate(exp(-x)*deltafunctions.DiracDelta(10*x-10), (x, -oo, oo)) #
Today
exp(-1)/10
integrate(exp(-x)*deltafunctions.DiracDelta(10*x-10), (x, -oo, oo)) #
Year ago
exp(-1)
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