Function eggholder

pub fn eggholder<T>(param: &[T; 2]) -> T
where
    T: Float + FromPrimitive,

Eggholder test function

Defined as

f(x_1, x_2) = -(x_2 + 47) * sin( sqrt( abs( x_2 + x_1/2 + 47 ) ) ) - x_1 * sin( sqrt( abs( x_1 - (x_2 + 47) ) ) )

where x_i \in [-512, 512].

The global minimum is at * f(x_1, x_2) = f(512, 404.2319) = -959.6407.