Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
Drexel University or The Math Forum.


Matt J
Posts:
4,996
Registered:
11/28/09


Re: Optimization
Posted:
Nov 22, 2012 2:16 PM


"Carlos Alejandro Perez Lasso" <carlosalejandro85@gmail.com> wrote in message <k8lisn$aqf$1@newscl01ah.mathworks.com>... > > I will try lsqcurvefit and see what happens. > Regarding the objective function, it doesn't have quantizing operations like the once you described above. It does contain operations that write python scripts to produce input files for running Abaqus simulation and retrieve information once the simulation is done. =================
It seems like it would be hard to know in advance whether such a function was even differentiable. As for local flatness, an easy test you can do is
small=1e6;
for i=1:N f(x)f(x+small*rand(size(x))) end
If this returns N zeros, it's a strong sign know your objective function f() is locally flat.



