Comment on BastiThoughtsOnPlotting in sympy

2009-04-28 Thread codesite-noreply
Comment by TNTricker: I don't know if this has been brought up but what about the ability to trace and evaluate the functions on the plot? or some support to render intervals on an axis in multiples of pi,e,i, or any other arbitrary value. For more information:

Issue 1396 in sympy: separate pyglet from sympy, ship all in one package: SPD

2009-04-28 Thread codesite-noreply
Status: Accepted Owner: ondrej.certik Labels: Type-Defect Priority-Medium New issue 1396 by ondrej.certik: separate pyglet from sympy, ship all in one package: SPD http://code.google.com/p/sympy/issues/detail?id=1396 When the SPD project matures enough: http://code.google.com/p/spdproject/

Issue 1397 in sympy: solve fails for a sum of two fractions

2009-04-28 Thread codesite-noreply
Updates: Labels: Solvers Comment #1 on issue 1397 by ondrej.certik: solve fails for a sum of two fractions http://code.google.com/p/sympy/issues/detail?id=1397 (No comment was entered for this change.) -- You received this message because you are listed in the owner or CC fields of

[sympy] Re: Trigsimp error

2009-04-28 Thread Luke
Incidentally, trying trigsimp with recursive=True, deep=True, or both True didn't give the desired result. On Tue, Apr 28, 2009 at 12:22 AM, Luke hazelnu...@gmail.com wrote: I'm writing some tests for some code that expresses a Vector expression in the coordinates of a different frame. I am

[sympy] Injecting symbols/variables into the workspace

2009-04-28 Thread Luke
I would like to write something that works similarly to var(), but injects implicit functions of a symbol (in my case 't'), i.e.: gc('q1 q2 q3') (q1, q2, q3) q1 q1(t) gc stands for Generalized Coordinate in mechanics these are typically always functions of time. Even better would be

[sympy] Re: Trigsimp error

2009-04-28 Thread Akshay Srinivasan
I think trigsimp is too hack-ish. I'll try implementing the algorithm given at http://vv.cn/d/d.aspx?Id=21987_1.0.42119 - I guess this is the one Ondrej was talking about - in the coming weeks. I'm still not sure how good it is, does anyone know of anything better ? Akshay On Apr 28, 6:52 pm,

[sympy] Re: Trigsimp error

2009-04-28 Thread Luke
It isn't too pressing for PyDy, I just ran into it when creating some tests that would ensure PyDy gave the same output as Autolev. In Autolev, if you express a UnitVector from one reference in the coordinates of another reference frame that is 3 or more simple rotations away, when you convert

[sympy] Re: Trigsimp error

2009-04-28 Thread Alan Bromborsky
Luke wrote: It isn't too pressing for PyDy, I just ran into it when creating some tests that would ensure PyDy gave the same output as Autolev. In Autolev, if you express a UnitVector from one reference in the coordinates of another reference frame that is 3 or more simple rotations away,

[sympy] Re: Trigsimp error

2009-04-28 Thread Akshay Srinivasan
Freddie Witherden wrote: Hi all, I think trigsimp is too hack-ish. I'll try implementing the algorithm given at http://vv.cn/d/d.aspx?Id=21987_1.0.42119 - I guess this is the one Ondrej was talking about - in the coming weeks. I'm still not sure how good it is, does anyone know of anything

[sympy] Re: Trigsimp error

2009-04-28 Thread Luke
I just finished reading this paper. It seems pretty reasonable, and not to difficult to implement. Does anybody know of any other papers on this subject that might offer alternative methods that would be worth looking at? If there was some sort of gold standard paper on the subject, that might

[sympy] Re: Trigsimp error

2009-04-28 Thread Ondrej Certik
On Tue, Apr 28, 2009 at 6:17 PM, Alan Bromborsky abro...@verizon.net wrote: Luke wrote: I just finished reading this paper.  It seems pretty reasonable, and not to difficult to implement.  Does anybody know of any other papers on this subject that might offer alternative methods that would