Re: [Axiom-developer] How to do generic sum using aldor?

[Gernot Hueber]

You also can use reduce. E.g. reduce(+, [1,2,3]) 

Gernot 

Ralf Hemmecke writes: 

> You should have read previous posts. Axiom does not understand "extend". 
>
> The following code does what you want. Just say 
>
> %axiom
> )co sumlist.as
> sumlist [1,2,3] 
>
> ---BEGIN sumlist.as
> #include "axiom"
> SumPackage(R: Ring): with {
>     sumlist: List R -> R;
> } == add {
>      sumlist (l: List R): R == {
>          s: R := 0;
>          for x in l repeat  s:= s+x;
>          return s
>      }
> }
> ---END sumlist.as 
>
> Have fun
> Ralf 
>
>
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