Figure 8From: Nonstandard finite difference variational integrators for nonlinear Schrödinger equation with variable coefficients l 2 -error of the implicit Euler method (17) and the NSFD variational integrator (14). l 2 -error of the implicit Euler method (17) and the NSFD variational integrator (14) for the NLSE with variable coefficients (16) (μ=1). Δt=0.1 and Δx=0.1.Back to article page