Ben Bolker <bbolker <at> gmail.com> writes: > > Simulated annealing and other stochastic global optimization > methods are also possible solutions, although they may or may not > work better than the many-starting-points solution -- it depends > on the problem, and pretty much everything has to be tuned. Tabu > search <http://en.wikipedia.org/wiki/Tabu_search> is another possibility, > although I don't know much about it ... >
It is known that the Excel Solver has much improved during recent years. Still there are slightly better points such as myfunc(c(0.889764228112319, 94701144.5712312)) # 334.18844 restricting the domain to [0, 1] x [0, 10^9] for an evolutionary approach, for instance DEoptim::DEoptim(). Finding a global optimum in 2 dimensions is not so difficult. Here the scale of the second variable could pose a problem as small local minima might be overlooked easily. Hans Werner ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.