On the new family of optimal eighth order methods developed by Lotfi et al.
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Recently Lotfi et al. (Numer. Algor. 68, 261-288, 2015) have developed a new family of optimal order eight for the solution of nonlinear equations. they have experimented with 3 members of the family and compared them to other eight order methods. One of the best known eight order method was not included. They also did not mention the best choice of parameters in the methods used and why. the basins of attraction were given for several examples without a quantitative comparison. It will be shown how to choose the best parameters in all these methods, and to quantitatively compare the methods.
The article of record as published may be found at http://dx.doi.org/10.1007/s11075-015-0048-9
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