Fig. 2
From: Numerical simulations of multicomponent ecological models with adaptive methods
Stability region of the ETDRK4 scheme (19). Boundary of stability regions in the complex x plane for the ETDRK4 scheme at (a) when y = 0, which correspond to the stability regions of the classical fourth-order Runge-Kutta method, and (b) shows the curve of ETDRK4 at some negative values of y = −15, −10, −5, from outer to the inner curves. The innermost curve corresponds to the stability region of (a) at y = 0