On Feb 1, 2008 12:00 PM, Chris Sangwin <sangwinc at for.mat.bham.ac.uk> wrote:
> You might be interested in looking up the mathematical background to the
> "Lambert W function".
>
> http://www.cs.uwaterloo.ca/research/tr/1993/03/W.pdf
>
> I don't know of a Maxima implementaion of this (very useful) special
> function.
Thanks, Chris. Matbe Maple has it implemented, as
> f := x -> exp(-x)*x-0.05;
f := x -> exp(-x) x - 0.05
> solve(f(x),x);
0.05270598355, 4.499755289
Paul
> On Fri, 1 Feb 2008, Paul Smith wrote:
>
> > On Feb 1, 2008 11:31 AM, Paul Smith <phhs80 at gmail.com> wrote:
> >> Is there some trick to have Maxima solving the following equation:
> >>
> >> f(x):=x*exp(-x)-0.05;
> >> solve(f(x),x);
> >>
> >> ?
> >
> > Well, with plot2d I identified the localization of the roots and then
> > I got the value of them with:
> >
> > find_root(f(x),x,2,5);
> > find_root(f(x),x,0,2);
> >
> > Paul
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> >
>