On Tue, Jun 25, 2013 at 2:32 PM, F. B. <franz.bona...@gmail.com> wrote: > Can this be done on the DifferentialOperator too?
Sure, _eval_power works on everything. > > It would be nice to have a simple implementation of the exponential of a > diff operator, such as exp(diff_op_instance), it would be very helpful for > many physicists. > > (by the way, the exp of a DifferentialOperator requires pdsolve to be able > to handle initial conditions... I think it's going to take some time) Not if you submit a pull request... Aaron Meurer > > > On Monday, June 24, 2013 11:06:24 PM UTC+2, Aaron Meurer wrote: >> >> Actually, fixing this just involves fixing >> https://code.google.com/p/sympy/issues/detail?id=1799, because Pow >> already has this logic (_eval_power). >> >> Oh, and I guess Matrix._eval_power would need to be implemented >> (currently it raises NotImplementedError, but this is easy to fix, >> just make a**Matrix give exp(log(a)*Matrix). Even with that fixed, you >> could do E**Matrix, before issue 1799 is fixed. >> >> Aaron Meurer >> >> On Mon, Jun 24, 2013 at 12:37 PM, F. B. <franz....@gmail.com> wrote: >> > Hi, I noticed the Matrix.exp() function which calculates the exponential >> > of >> > a Matrix. >> > >> > The exp() function fails when calling exp(matrix) because it does not >> > recognize the matrix object. >> > >> > exp is a class inheriting the "Function" object. >> > >> > What about creating an "ForwardFunction" object which tries to look for >> > methods having the same name of the class to apply it? >> > >> > For example, the exp() function would not recognize a Matrix object in >> > its >> > algorithm, but would notice the Matrix.exp() method on its arg and call >> > it. >> > >> > -- >> > You received this message because you are subscribed to the Google >> > Groups >> > "sympy" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> > an >> > email to sympy+un...@googlegroups.com. >> > To post to this group, send email to sy...@googlegroups.com. >> > Visit this group at http://groups.google.com/group/sympy. >> > For more options, visit https://groups.google.com/groups/opt_out. >> > >> > > > -- > You received this message because you are subscribed to the Google Groups > "sympy" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sympy+unsubscr...@googlegroups.com. > To post to this group, send email to sympy@googlegroups.com. > Visit this group at http://groups.google.com/group/sympy. > For more options, visit https://groups.google.com/groups/opt_out. > > -- You received this message because you are subscribed to the Google Groups "sympy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sympy+unsubscr...@googlegroups.com. To post to this group, send email to sympy@googlegroups.com. Visit this group at http://groups.google.com/group/sympy. For more options, visit https://groups.google.com/groups/opt_out.
