Updates:
Status: Started
Owner: julien.r...@gmail.com
Labels: NeedsReview
Comment #8 on issue 2630 by julien.r...@gmail.com: DeltaIntegrate provides
wrong answer on Multivariable integrals
http://code.google.com/p/sympy/issues/detail?id=2630
This works in https://github.com/sympy/sympy/pull/1620:
In [1]: densityX = exp(-x**2/2)/sqrt(2*pi)
In [2]: densityY = exp(-y**2/2)/sqrt(2*pi)
In [3]: integrate(densityX*densityY, (x, -oo, oo), (y, -oo, oo))
Out[3]: 1
In [4]: integrate(densityX*densityY * DiracDelta(10*x+y-1), (x, -oo, oo),
(y, -oo, oo)).evalf()
Out[4]: 0.0395002101563691
In [5]: integrate(densityX*densityY * DiracDelta(x+10*y-1), (x, -oo, oo),
(y, -oo, oo)).evalf()
Out[5]: 0.0395002101563691
The example from comment #8 was added as a test.
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