This single-objective function follows the definition $$f(\mathbf{x}) = \mathbf{x}_1^2 + \mathbf{x}_2^2 + 25(\sin^2(\mathbf{x}_1) + \sin^2(\mathbf{x}_2))$$ with \(\mathbf{x}_i \in [-5, 5]\) for \(i = 1, 2\).
makeEggCrateFunction()[smoof_single_objective_function]