On Mon, Jul 16, 2012 at 7:08 PM, Junjun Xu <junjunxu87 at gmail.com> wrote:
> I'm trying to solve a integration equation, but there is something wrong
> with it and I can't understand it.
> Does anyone can tell me where the problem is? I am a beginner of maxima.
> Many thanks!!
>
> The code is like this:
>
> f(x):=quad_qags(x*k,k,0,1)[1]$
> g(x):=romberg(x*k,k,0,1)$
> load("mnewton")$
> mnewton(f(x)-0.5,x,1);
> mnewton(g(x)-0.5,x,1);
>
Doesn't Newton's method require the symbolic derivative? I think it's
pretty hard to get that when all you have is a function that returns
numbers.
You may want to use find_root for your examples. find_root doesn't need a
symbolic derivative.
Ray