Multimodal test function based on the definition $$f(\mathbf{x}) = 0.6 + \sum_{i = 1}^{n} \left[\sin(\frac{16}{15} \mathbf{x}_i - 1) + \sin^2(\frac{16}{15}\mathbf{x}_i - 1) + \frac{1}{50} \sin(4(\frac{16}{15}\mathbf{x}_i - 1))\right]$$ with box-constraints \(\mathbf{x}_i \in [-1, 1]\) for \(i = 1, \ldots, n\).
makeGiuntaFunction()[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.