Re: Issue 1113 in sympy: rewrite sign(x) (and possibly abs()) using Piecewise

Comment #13 on issue 1113 by asmeu...@gmail.com: rewrite sign(x) (and possibly abs()) using Piecewise http://code.google.com/p/sympy/issues/detail?id=1113 One major issue with integrals containing absolute values is the way we represent the derivative of abs(x). For real x, it comes out as

Issue 4050 in sympy: integrate((3*x - 5)**2/(2*x - 1)**(7/2), x) _CoeffExpValueError

Status: New Owner: Labels: Type-Defect Priority-Medium New issue 4050 by ppue...@googlemail.com: integrate((3*x - 5)**2/(2*x - 1)**(7/2), x) _CoeffExpValueError http://code.google.com/p/sympy/issues/detail?id=4050 Correct answer is (-41 + 80*x - 45*x**2)/(5*(2*x-1)**Rational(5/2))

Re: Issue 4050 in sympy: integrate((3*x - 5)**2/(2*x - 1)**(7/2), x) _CoeffExpValueError

Updates: Status: Valid Cc: ness...@googlemail.com Labels: Integration Comment #3 on issue 4050 by asmeu...@gmail.com: integrate((3*x - 5)**2/(2*x - 1)**(7/2), x) _CoeffExpValueError http://code.google.com/p/sympy/issues/detail?id=4050 Unfortunately not an infinite

Re: Issue 1216 in sympy: series expansion of piecewise fails

Comment #7 on issue 1216 by asmeu...@gmail.com: series expansion of piecewise fails http://code.google.com/p/sympy/issues/detail?id=1216 Yeah, it should plug the point into the conditions and remove those that it knows are false. -- You received this message because this project is

Re: Issue 4039 in sympy: How to solve system of differencial equtions with symbolic solution?

Updates: Status: Valid Labels: Solvers Comment #1 on issue 4039 by asmeu...@gmail.com: How to solve system of differencial equtions with symbolic solution? http://code.google.com/p/sympy/issues/detail?id=4039 Systems of ODEs aren't supported yet. Some work was started at

Re: Issue 4038 in sympy: Product().doit().simplify() raises OverflowError: cannot convert float infinity to integer

Comment #2 on issue 4038 by asmeu...@gmail.com: Product().doit().simplify() raises OverflowError: cannot convert float infinity to integer http://code.google.com/p/sympy/issues/detail?id=4038 I guess there are two bugs here. The thing being called by simplify() shouldn't raise that error.

Re: Issue 4036 in sympy: rewrite(binomial) does not convert factorial expression

Updates: Status: Valid Labels: Simplify Concrete Comment #1 on issue 4036 by asmeu...@gmail.com: rewrite(binomial) does not convert factorial expression http://code.google.com/p/sympy/issues/detail?id=4036 Can this be made to work with the current rewrite framework? I think

Re: Issue 4035 in sympy: fibonacci(n) + fibonacci(n + 1) not simplified

Updates: Status: Valid Labels: Simplify Concrete Comment #1 on issue 4035 by asmeu...@gmail.com: fibonacci(n) + fibonacci(n + 1) not simplified http://code.google.com/p/sympy/issues/detail?id=4035 I guess this can go in combsimp. fibonacci is not really a combinatorial

Issue 4051 in sympy: xreplace and Transform doesn't go deep enough

Status: Valid Owner: Labels: Type-Defect Priority-Medium Core New issue 4051 by asmeu...@gmail.com: xreplace and Transform doesn't go deep enough http://code.google.com/p/sympy/issues/detail?id=4051 I thought this used to work. I had this pasted into a thread in the mailing list from