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Two step extrapolation and optimum choice of relaxation factor of the extrapolated S.O.R. method

Jan Zítko (1988)

Aplikace matematiky

Limits of the extrapolation coefficients are rational functions of several poles with the largest moduli of the resolvent operator R ( λ , T ) = ( λ I - T ) - 1 and therefore good estimates of these poles could be calculated from these coefficients. The calculation is very easy for the case of two coefficients and its practical effect in finite dimensional space is considerable. The results are used for acceleration of S.O.R. method.

Weaker convergence conditions for the secant method

Ioannis K. Argyros, Saïd Hilout (2014)

Applications of Mathematics

We use tighter majorizing sequences than in earlier studies to provide a semilocal convergence analysis for the secant method. Our sufficient convergence conditions are also weaker. Numerical examples are provided where earlier conditions do not hold but for which the new conditions are satisfied.

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