Single-objective two-dimensional test function. The formula is given as $$f(\mathbf{x}) = 1 + \sin^2(\mathbf{x}_1) + \sin^2(\mathbf{x}_2) - 0.1e^{-(\mathbf{x}_1^2 + \mathbf{x}_2^2)}$$ subject to the constraints \(\mathbf{x}_i \in [-10, 10], i = 1, 2.\)
makePeriodicFunction()[smoof_single_objective_function]
M. M. Ali, C. Khompatraporn, Z. B. Zabinsky, A Numerical Evaluation of Several Stochastic Algorithms on Selected Continuous Global Optimization Test Problems, Journal of Global Optimization, vol. 31, pp. 635-672, 2005.