Non-scalable, two-dimensional test function for numerical optimization with $$f(\mathbf{x}) = -0.0001\left(|\sin(\mathbf{x}_1\mathbf{x}_2\exp(|100 - [(\mathbf{x}_1^2 + \mathbf{x}_2^2)]^{0.5} / \pi|)| + 1\right)^{0.1}$$ subject to \(\mathbf{x}_i \in [-15, 15]\) for \(i = 1, 2\).
makeCrossInTrayFunction()[smoof_single_objective_function]
S. K. Mishra, Global Optimization By Differential Evolution and Particle Swarm Methods: Evaluation On Some Benchmark Functions, Munich Research Papers in Economics.