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Table 1 Mathematical functions: two unimodal functions and four multimodal functions

From: Tuning rectangular microstrip antenna through scan and zoom algorithm

Number Function Property
f 1 Spherical function Unimodal, separable, scalable
f 2 Different power function Unimodal, separable, scalable
f 3 Rastrigin function Multimodal, separable, scalable
f 4 Rosenbrock function Multimodal, nonseparable, scalable
f 5 Ackley function Multimodal, nonseparable, scalable
f 6 Rotated Schwefel function Multimodal, nonseparable, scalable