generate_discus_function: Discus test function generator.
Description
The discus test function is similar to a high condition
ellipsoid. It is defined as
Usage
generate_discus_function(dimensions)
Arguments
dimensions
[integer(1)] Size of parameter space.
Value
A soo_function.
Note that the functions returned by this generator only differ in
the elongated axis from those returned by
generate_ellipsoidal_function.
Details
$$f(x) = 10^6 x_1^2 + \sum_{i=2}^n x_i^2$$