Abstract
For a system of coupled anharmonic oscillators we compare the convergence rate of the variational collocation approach presented recently by Amore and Fernández (2010 Phys. Scr.81 045011) with the one obtained using the optimized Rayleigh–Ritz (RR) method. The monotonic convergence of the RR method allows us to obtain more accurate results at a lower computational cost.
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