On Mon, Apr 4, 2011 at 8:58 AM, Frank K. <ylfch...@gmail.com> wrote: > >> > There's also the line somewhere in between numerical matrices and symbolic >> > matrices, which is matrices with exact numeric values (instances of >> > Rational), to consider. >> >> Not sure what you are getting at here. >> > > There are some sparse matrix algorithms that are quite speedy, but > give approximate answers (so you get a determinant with a little error > bar, for example). These might be usable on a Rational matrix, but > certainly not a symbolic one. > > Perhaps this is what Aaron is getting at, or just something I've made > up!
Only exact iterative methods, such as conjugate gradients, are feasible in SymPy. SymPy expressions have no real way to do any minimization or determine small fill-in so these methods are out from the get go. > > -- > 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.
