Schwefel's Problem 2.13
x \in [-π,π]^D
Global optimum F(x^*) = -460
Either a vector with 2, 10, 30 or 50 elements or a matrix with the same number of columns and one row for each vector to be evaluated
A vector with the evaluation of the function for each row of
P. N. Suganthan, N. Hansen, J. J. Liang, K. Deb, Y.-P. Chen, A. Auger, S. Tiwari (2005). Problem Definitions and Evaluation Criteria for the CEC 2005 Special Session on Real-Parameter Optimization, Technical report, Nanyang Technological University, Singapore, May 2005, http://www.ntu.edu.sg/home/EPNSugan/index_files/CEC-05/CEC05.htm.