brown_test       Test optimx on the Brown function
broydt_test       Test optimx on a variant of the Broyden tridiagonal function
chen_test       Test optimx on the Chen function
froth_test       Test optimx on the Freudenstein and Roth function
maxtestJN       Test optimx with maximizing rather than minimizing
poissmix_test       Test optimx on a Poisson mixture problem
rosbkext_test       Test optimx on the Rosenbrock function (extended)
sc2_test       Test optimx on the SC2 function
trig_test       Test optimx on the trigonometric test function
valley_test       Test optimx on the valley function
vmmix_test       Test optimx on the mixture function
