172193.fig.002a
(a)
172193.fig.002b
(b)
172193.fig.002c
(c)
172193.fig.002d
(d)
Figure 2: The evolutionary process of PSO-VRS on test functions, (a) Rosenbrock function, (b) variably dimensioned function, (c) Wood function, and (d) Ackley function.