Himmelblau Function
Two-dimensional test function based on the function defintion
f(\mathbf{x}) = (\mathbf{x}_1^2 + \mathbf{x}_2 - 11)^2 + (\mathbf{x}_1 + \mathbf{x}_2^2 - 7)^2
with box-constraings \mathbf{x}_i \in [-5, 5], i = 1, 2.
makeHimmelblauFunction()
[smoof_single_objective_function]
D. M. Himmelblau, Applied Nonlinear Programming, McGraw-Hill, 1972.
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