Well , now as i have all the constraints and milestones to work on for the project ,so please suggest me if it is a worth idea for GSOC ? I will be submitting my proposal soon.
On Thu, Mar 29, 2012 at 12:29 AM, Aaron Meurer <asmeu...@gmail.com> wrote: > On Wed, Mar 28, 2012 at 6:12 AM, Tom Bachmann <e_mc...@web.de> wrote: > > Note also that, for computing with residues, you don't need a precise > list > > of the poles, just a *superset*. > > This reminds me of another point. Aside from symbolic parameters > changing the contour needed for convergence, it can also change where > the poles are. For example, if you end up with a contour around the > unit circle, and one of your poles is a*I, then answer will depend on > |a| (whether it is < or > than 1). You need to consider how to > express this for multiple parameters, and for potentially more > complicated contours. > > Aaron Meurer > > > Just as you don't need precise knowledge of > > the growth of the function, just an upper bound (although here you > probably > > want to be tighter). So it might be best to look at all parts of an > > expression in turn to determine the poles (i.e. recursively apply > poles(f+g) > > = poles(f) union poles(g), same for multiplication etc.) > > I think if you use solve(1/expr) to find the poles, then solve will do > this for you (addition and multiplication will both become > multiplication in that case, and solve already splits apart > expressions into multiplicative factors). Chris can correct me if I'm > wrong. > > Of course, if you're trying to be rigorous and only allow specific > forms that you know you can find all the roots for, you will have to > be more careful. It will probably be best to implement that in solve, > though. > > Aaron Meurer > > > > > > > On 28.03.2012 12:05, Chris Smith wrote: > >> > >> > >> > >> On Wed, Mar 28, 2012 at 4:42 PM, arpit goyal <agmp...@gmail.com > >> <mailto:agmp...@gmail.com>> wrote: > >> > >> Aaron , > >> I looked the code ,and then then tested the working > >> solve(x*cos(x),x) the answer was very accuraely given (not all x for > >> cos(x) was shown or general solutions was not shown ) but > >> solve(x**2*cos(x),x) , NotImplementedError: Unable to solve the > >> equation. > >> > >> > >> Be sure to get the current master since there, > >> > >> >>> solve(x**2*cos(x),x) > >> [0, pi/2] > >> > >> -- > >> You received this message because you are subscribed to the Google > >> Groups "sympy" group. > >> To post to this group, send email to sympy@googlegroups.com. > >> To unsubscribe from this group, send email to > >> sympy+unsubscr...@googlegroups.com. > >> For more options, visit this group at > >> http://groups.google.com/group/sympy?hl=en. > > > > > > -- > > You received this message because you are subscribed to the Google Groups > > "sympy" group. > > To post to this group, send email to sympy@googlegroups.com. > > To unsubscribe from this group, send email to > > sympy+unsubscr...@googlegroups.com. > > For more options, visit this group at > > http://groups.google.com/group/sympy?hl=en. > > > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To post to this group, send email to sympy@googlegroups.com. > To unsubscribe from this group, send email to > sympy+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/sympy?hl=en. > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To post to this group, send email to sympy@googlegroups.com. To unsubscribe from this group, send email to sympy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sympy?hl=en.
