Issue 2807 in sympy: Change .unit and .mag to proper methods and better names.

Status: New Owner: Labels: Type-Defect Priority-Medium New issue 2807 by moorepa...@gmail.com: Change .unit and .mag to proper methods and better names. http://code.google.com/p/sympy/issues/detail?id=2807 sympy.physics.mechanics .unit and .mag properties of the Vector class are a bit c

Re: Issue 716 in sympy: either tangent_line or is_tangent is wrong

Updates: Labels: CodeInCategory-Code CodeInDifficulty-Medium Comment #2 on issue 716 by smi...@gmail.com: either tangent_line or is_tangent is wrong http://code.google.com/p/sympy/issues/detail?id=716 Here are some examples of how to get it to 0: S(' -(36 - 72*cos(1)**2 - 36*sin(1)*

Re: Issue 2574 in sympy: Wrong assumptions for LambertW(-1)

Comment #12 on issue 2574 by smi...@gmail.com: Wrong assumptions for LambertW(-1) http://code.google.com/p/sympy/issues/detail?id=2574 Is this related: -2 + exp(exp(LambertW(log(2)))*LambertW(log(2))) z.evalf() -.0e-123 z.is_nonzero True It should be False (or at least None), shouldn't

Re: Issue 2205 in sympy: Name for "Undefined functions"

Comment #24 on issue 2205 by smi...@gmail.com: Name for "Undefined functions" http://code.google.com/p/sympy/issues/detail?id=2205 btw, there is a function ode.py to identify undefined functions. It's called is_unfunc. -- You received this message because you are subscribed to the Google

Re: Issue 2802 in sympy: solve error with expression with derivative

Updates: Labels: -NeedsBetterPatch NeedsReview Comment #11 on issue 2802 by smi...@gmail.com: solve error with expression with derivative http://code.google.com/p/sympy/issues/detail?id=2802 A more complete implicit solving is now implemented and the problem of this issue (which was

Re: Issue 2807 in sympy: Change .unit and .mag to proper methods and better names.

Updates: Status: Accepted Cc: gilbertg...@gmail.com Labels: Mechanics Milestone-Release0.7.2 Comment #1 on issue 2807 by asmeu...@gmail.com: Change .unit and .mag to proper methods and better names. http://code.google.com/p/sympy/issues/detail?id=2807 I only have a cur

4 issues changed in sympy

Updates: Cc: gilbertg...@gmail.com hazelnu...@gmail.com Cc: hazelnu...@gmail.com Comment by asmeu...@gmail.com: (No comment was entered for this change.) Affected issues: issue 2781: orientnew in sympy.physics.mechanics does not support indices http://code.google.com/p/symp

Issue 2808 in sympy: integrate(1/(x**2 + a**2)**2, x) is wrong if a is real

Status: Accepted Owner: Labels: Type-Defect Priority-Medium Assumptions Integration WrongResult New issue 2808 by asmeu...@gmail.com: integrate(1/(x**2 + a**2)**2, x) is wrong if a is real http://code.google.com/p/sympy/issues/detail?id=2808 In [4]: a = Symbol('a', positive=True) In [5]

Re: Issue 2802 in sympy: solve error with expression with derivative

Comment #12 on issue 2802 by asmeu...@gmail.com: solve error with expression with derivative http://code.google.com/p/sympy/issues/detail?id=2802 This sounds a little shaky. I think in Maple, you can solve for non-symbols, but it prints a warning when you do telling you that it's a bad i

Re: Issue 2808 in sympy: integrate(1/(x**2 + a**2)**2, x) is wrong if a is real

Updates: Cc: matt...@gmail.com Comment #1 on issue 2808 by asmeu...@gmail.com: integrate(1/(x**2 + a**2)**2, x) is wrong if a is real http://code.google.com/p/sympy/issues/detail?id=2808 Note that this used to work in SymPy 0.7.0: In [1]: a = Symbol('a', real=True) In [2]: integrate

Re: Issue 2555 in sympy: Wrong result from residue

Comment #6 on issue 2555 by asmeu...@gmail.com: Wrong result from residue http://code.google.com/p/sympy/issues/detail?id=2555 Here's yet another one. I don't know why this one happens, because the series seems to be correct (I think it renormalizes around the point or something, but the co

Issue 2809 in sympy: evalf() doesn't go all the way

Status: Accepted Owner: Labels: Type-Defect Priority-Medium New issue 2809 by asmeu...@gmail.com: evalf() doesn't go all the way http://code.google.com/p/sympy/issues/detail?id=2809 In [53]: 2*pi*I*(cos(k*abs(a)*I)/(2*abs(a)*I*(b**2 - a**2)) + cos(k*abs(b)*I)/(2*abs(b)*I*(a**2 - b**2))).s

Issue 2810 in sympy: Cannot do integrate(cos(k*x)/(x**2 + a**2)/(x**2 + b**2), (x, -oo, oo))

Status: Accepted Owner: CC: ness...@gmail.com Labels: Type-Defect Priority-Medium Integration New issue 2810 by asmeu...@gmail.com: Cannot do integrate(cos(k*x)/(x**2 + a**2)/(x**2 + b**2), (x, -oo, oo)) http://code.google.com/p/sympy/issues/detail?id=2810 This is in Tom's gsoc-3 branch.

Re: Issue 2802 in sympy: solve error with expression with derivative

Comment #13 on issue 2802 by smi...@gmail.com: solve error with expression with derivative http://code.google.com/p/sympy/issues/detail?id=2802 yes -- You received this message because you are subscribed to the Google Groups "sympy-issues" group. To post to this group, send email to sympy-i

Re: Issue 2802 in sympy: solve error with expression with derivative

Comment #14 on issue 2802 by smi...@gmail.com: solve error with expression with derivative http://code.google.com/p/sympy/issues/detail?id=2802 When xreplace is in place this shouldn't be shaky...but we will suffer from the evaluative subs until then: ```python y**(3/2) + y y**3 + y**2 ```

Re: Issue 2804 in sympy: could_extract_minus_sign should look in the denominator

Updates: Status: Duplicate Mergedinto: 1993 Comment #1 on issue 2804 by smi...@gmail.com: could_extract_minus_sign should look in the denominator http://code.google.com/p/sympy/issues/detail?id=2804 (No comment was entered for this change.) -- You received this message becaus

Re: Issue 1993 in sympy: make sign simlification part of canonicalizing process

Comment #2 on issue 1993 by smi...@gmail.com: make sign simlification part of canonicalizing process http://code.google.com/p/sympy/issues/detail?id=1993 Issue 2804 has been merged into this issue. -- You received this message because you are subscribed to the Google Groups "sympy-issues" g

Re: Issue 1993 in sympy: make sign simlification part of canonicalizing process

Comment #3 on issue 1993 by smi...@gmail.com: make sign simlification part of canonicalizing process http://code.google.com/p/sympy/issues/detail?id=1993 Another area where sign simplification would be nice is for expressions like a(x-y)-a*(y-x) or 1/(x-y) + 1/(y-x) It shouldn't take a fu

Re: Issue 1583 in sympy: evalf doesn't evaluate arguments to functions if they have symbols

Comment #1 on issue 1583 by smi...@gmail.com: evalf doesn't evaluate arguments to functions if they have symbols http://code.google.com/p/sympy/issues/detail?id=1583 Issue 2809 has been merged into this issue. -- You received this message because you are subscribed to the Google Groups "sym

Re: Issue 2809 in sympy: evalf() doesn't go all the way

Updates: Status: Duplicate Mergedinto: 1583 Comment #1 on issue 2809 by smi...@gmail.com: evalf() doesn't go all the way http://code.google.com/p/sympy/issues/detail?id=2809 (No comment was entered for this change.) -- You received this message because you are subscribed to the

Re: Issue 1583 in sympy: evalf doesn't evaluate arguments to functions if they have symbols

Comment #2 on issue 1583 by smi...@gmail.com: evalf doesn't evaluate arguments to functions if they have symbols http://code.google.com/p/sympy/issues/detail?id=1583 Issue 2809 is similar in that even (3.0*pi).n() doesn't become a number. We've made functions containing floats evaluate; we

Re: Issue 2807 in sympy: Change .unit and .mag to proper methods and better names.

Comment #3 on issue 2807 by gg...@ucdavis.edu: Change .unit and .mag to proper methods and better names. http://code.google.com/p/sympy/issues/detail?id=2807 Changing them to methods is a good idea. I woud prefer something else instead of .normalize(self) though, as I think it could be a li