In this paper, a few single-step iterative methods, including classical Newton's method and Halley's method, are suggested by applying [1, n]-order Padé approximation of function for finding the roots of nonlinear equations at first. In order to avoid the operation of high-order derivatives of function, we modify the presented methods with fourth-order convergence by using the approximants of the second derivative and third derivative, respectively. Thus, several modified two-step iterative methods are obtained for solving nonlinear equations, and the convergence of the variants is then analyzed that they are of the fourth-order convergence. Finally, numerical experiments are given to illustrate the practicability of the suggested variants. Henceforth, the variants with fourth-order convergence have been considered as the imperative improvements to find the roots of nonlinear equations.
CITATION STYLE
Li, S., Liu, X., & Zhang, X. (2019). A few iterative methods by using [1, n]-order Padé approximation of function and the improvements. Mathematics, 7(1). https://doi.org/10.3390/math7010055
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