On 10 ago, 18:42, Chris Smith <smi...@gmail.com> wrote: > On Thu, Aug 11, 2011 at 12:40 AM, Roberto Colistete Jr. > > > > <roberto.colist...@gmail.com> wrote: > > Hi, > > > I have not found a simple way to map a function to a mathematical > > expression with sum of items. Is there anything simple to do it ? I > > was thinking it would be simples, like "map(expand,expr)" but it > > doesn't work. > > > In the meantime, I have solved this issue with the code : > > > def mapexpr(self,expr,func): > > if isinstance(expr,Add): > > return apply(Add,map(func,expr.args)) > > else: > > return func(expr) > > It sounds like you want to apply the function term-wise. What you have > written above can be simplified to > > def map_termwise(func, expr): > return Add(*[func(a) for a in Add.make_args(expr)]) > > There is also a Mul.make_args. Both Add and Mul make_args methods > interpret the expr as an Add or Mul, respectively.
Thanks, I will compare the performance of your implementation with mine. -- 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.
