Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium WrongResult
New issue 3648 by [email protected]: Define integral of Piecewise
problem.
http://code.google.com/p/sympy/issues/detail?id=3648
When Piecewise is a multivariate function of x and y, with conditions on y,
and it is integrated w.r.t. x, everything seems to work fine for indefinite
integration, but we loose the conditions on y when we do a define
integration.
from sympy import Eq, Piecewise, integrate
from sympy.abc import x, y
p = Piecewise((1, Eq(y, 0)), (x*y, True))
integrate(p, x) # ok
Piecewise((x, y == 0), (x**2*y/2, True))
integrate(p, (x, 1, 3)) # oups, loss the condition on y
4*y
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