Raymond Toy wrote:
>>>>>>"van.Nek" == van Nek <van.Nek at gmx.net> writes:
>
>
> van.Nek> Hello Ray, factoring isn't as hard as you might
> van.Nek> think. There is a new implementation of integer factoring
> van.Nek> in cvs now. In src/ifactor.lisp you will find a function
> van.Nek> `get-factor-list', which could possibly fit your
> van.Nek> needs. Give it a try. Remark: there will be version 1.3
> van.Nek> of ifactor.lisp in a couple of days. Some things will
> van.Nek> change a little bit, but `get-factor-list' will remain
> van.Nek> unchanged. Volker
>
> [snip]
>
> van.Nek> (%i5) :lisp(get-factor-list 123456789)
> van.Nek> ((3803 1) (3607 1) (3 2))
>
> van.Nek> (%i5) :lisp(get-factor-list 1024)
> van.Nek> ((2 10))
>
> Neat.
>
> What do people think? Should maxima try harder to simplify things
> like 6*2^k to 3*2^(k+1)?
>
> Ray
Yes. Though maybe it could be called only from functions like ratsimp?
Joal Heagney