Spectral Fixed Point Method for Nonlinear Oscillation Equation with Periodic Solution

Figure 3

Relative error [𝑢_𝑛(𝑡)/𝑢_R-K(𝑡)−1] between 𝑢_𝑛(𝑡) and 𝑢_R-K, (𝑁_SDS=5; 𝛿=10⁻¹⁶).

(a) 5th approximation 𝑢₅(𝑡)

(b) 10th approximation 𝑢₁₀(𝑡)