In this study, we analyze the experimental results in Gong et al. (2008), and find that the box plots of the coverage metric in solving the five three-objective problems are wrong. The corresponding corrected box plots are presented. The corrected results are still consistent with the original conclusions.

The Rosenbrock function is a well-known benchmark for numerical optimization problems, which is frequently used to assess the performance of Evolutionary Algorithms. The classical Rosenbrock function, which is a two-dimensional unimodal function, has been extended to higher dimensions in recent years. Many researchers take the high-dimensional Rosenbrock function as a unimodal function by instinct. In 2001 and 2002, Hansen and Deb found that the Rosenbrock function is not a unimodal function for higher dimensions although no theoretical analysis was provided. This paper shows that the n -dimensional ( n = 4 ∼ 30) Rosenbrock function has 2 minima, and analysis is proposed to verify this. The local minima in some cases are presented. In addition, this paper demonstrates that one of the “local minima” for the 20-variable Rosenbrock function found by Deb might not in fact be a local minimum.