具有六阶收敛的HN方法的一些推广
Some improvements of HN method with sixth-order covergence
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摘要: 通过推广三阶的调和平均牛顿法(HN方法),给出了2类在实数范围内求解非线性方程的六阶方法及其收敛性证明.考虑计算效率,本文方法每步计算2个函数值和2个导数值,效率指数为1.565.将本文方法与牛顿法、HN方法及其他已知方法进行比较,结果表明了本文方法的优越性.最后给出了AN方法(代数平均牛顿方法)的推广.Abstract: Two families of sixth-order methods are developed by extending a third-order HN method (harmonic mean Newton's method) for finding the real roots of nonlinear equation in R.The convergence analysis is provided to establish their sixth-order of convergence.In terms of computational cost,they require evaluations of only two functions and two first derivatives per iteration.This implies that efficiency index of our methods are 1.565.Our methods are comparable with Newton's method,HN method and others,as we show in some examples.In the end,some improvements of AN method (arithmetic mean Newton's method) were given.
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Key words:
- sixth-order convergence /
- non linear equation /
- HN method /
- iterative method
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