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ANNEAL Simulated annealing technique. This may require a very large
number of function evaluation.
POWELL Gradient using the Powell method (see Press et al. for de-
SIMPLEX Classical Simplex amoeba search
ROBUST A combination of Simplex + Slatec, to be used with large ini-
SLATEC Modified Levenberg Marquardt method with adaptive steps, as
implement in the Slatec library.
All methods require a proper choice of initial values and steps. The AN-
NEAL method is much more robust against poor guesses, but may require 10
to 100 times more function evaluations than any other.