Test Functions

                      for Unconstrained Global Optimization

Trid Function

r Number of variables: n variables.

r Definition:

 

 

r Search domain: −n² ≤ x_i ≤ n², i = 1, 2, . . . , n.

r Number of local minima: no local minimum except the global one.

r The global minima:          f(x^*) = -50    for n=6,

                                                    f(x^*) = -200 for n=10.

r MATLAB Code: download trid.m

r Function graph: for n = 2.