Fig. 3

(a) The trajectory of the NN (12) in [17] with initial condition \(x_{0}=[-3,5,2]^{T}\); (b) The trajectory of the FiNN (13) with initial condition \(x_{0}=[-3,5,2]^{T}\); (c) The trajectory of the FxDS (14) with initial condition \(x_{0}=[-3,5,2]^{T}\); (d) The trajectory of the NFxNN (10) with initial condition \(x_{0}=[-3,5,2]^{T}\); (e) Convergence errors \(\log _{10}\Vert x(t)-x^{\ast}\Vert _{2}^{2}\) for the neural network (12) (red), the FiNN (13) (green), the FxDS (14) (purple) and the NFxNN (10) (blue)