On Mon, Apr 16, 2007 at 08:41:01AM -0600, Robert Dodier wrote:
> On 4/14/07, Albrecht Frenzel <afrenzel at 01019freenet.de> wrote:
>
> > LG(x,p):=Round(log(x)*p)/p;
> > Round(v):=floor(v+0.5);
> > Td(t,h):=-((1188500*t+282506450)*log(h)+20301957*t)/((5000*t+1188500)*log(h)-20301957);
> > TD(t,h,p):=-Round(((1188500*t+282506450)*LG(h,p)+20301957*t)/(Round(((5000*t+1188500)*LG(h,p)-20301957)/P)));
> > P:1000;
> > E(t,h,p):=(Td(t,h)*P-TD(t,h,p))/P;
>
> > Next I would like to compute min and max on some 2D interval
> > instead of plot3d.
...
> Looking at the plot made by plot3d for the function above, it is very
> bumpy. So it could well be that it is going to be difficult for any
> numerical method.
It looks like a nightmare for numerical methods. All the Round
functions make it steppy rather than smooth differentiable
surface. Albrecht, maybe you can describe more carefully what you are
after, perhaps at a higher level, and we can recommend some other
suggestions? It seems specific enough that you must have some goal in
mind beyond just checking out what maxima can do with a toy problem.
--
Daniel Lakeland
dlakelan at street-artists.org
http://www.street-artists.org/~dlakelan