Function matyas

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

Matyas test function

Defined as

f(x_1, x_2) = 0.26 * (x_1^2 + x_2^2) - 0.48 * x_1 * x_2

where x_i \in [-10, 10].

The global minimum is at f(x_1, x_2) = f(0, 0) = 0.