Status: Accepted Owner: jorn.baayen CC: asmeurer Labels: Type-Defect Priority-Medium WrongResult
New issue 1739 by jorn.baayen: Constants 'C_i' in differential equations confuse solver http://code.google.com/p/sympy/issues/detail?id=1739 The last call to dsolve() in the following snippet does not return the correct solution of the differential equation: the part 3 * C_1 is not integrated correctly. In [1]: eq = Eq(f(x).diff(x), 2 * x) In [2]: eq Out[2]: d ──(f(x)) = 2⋅x dx In [3]: sol = dsolve(eq, f(x)) In [4]: sol Out[4]: 2 f(x) = C₁ + x In [5]: g = 3 * sol.rhs In [6]: g Out[6]: 2 3⋅C₁ + 3⋅x In [7]: eq = Eq(f(x).diff(x), g) In [8]: eq Out[8]: d 2 ──(f(x)) = 3⋅C₁ + 3⋅x dx In [9]: dsolve(eq, f(x)) Out[9]: 3 f(x) = C₁ + C₂⋅x + x In [10]: -- You received this message because you are listed in the owner or CC fields of this issue, or because you starred this issue. You may adjust your issue notification preferences at: http://code.google.com/hosting/settings -- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-iss...@googlegroups.com. To unsubscribe from this group, send email to sympy-issues+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy-issues?hl=en.
