Continuous single-objective test function \(f\) with
$$f(\mathbf{x}) = \mathbf{x}_1^2 - 12 \mathbf{x}_1 + 11 + 10\cos(0.5\pi\mathbf{x}_1) + 8\sin(2.5\pi\mathbf{x}_1) - (0.25)^{0.5}\exp(-0.5(\mathbf{x}_2 - 0.5)^2)$$
with \(-30 \leq \mathbf{x}_i \leq 30, i = 1, 2\).