
Newton-like methods are discussed for finding a real solution of a system of nonlinear equations: \(F(x)=0\) in \(\mathbb R^n\). The authors propose a midpoint Newton method: \[ x^{(k+1)} = x^{(k)} - J_F((x^{(k)} + z^{(k)})/2)^{-1}F(x^{(k)}, \quad k=0, 1, \dots. \] Here \(J_F(x)\) is the Jacobian matrix of the function \(F\). \(z^{(k)}\) is defined via a Newton step as \[ z^{(k)} = x^{(k)}-J_F(x^{(k)})^{-1}F(x^{(k)}). \] The midpoint Newton method is proven to be of quadratic covergence and illustrated to be better than the Newton method itself with numerical examples. But it is not compared with the two step Newton method and the cost of evaluation of the function \(F\) and its Jacobian at each iteration step is not considered.
trapezoidal rule, numerical examples, fixed point iteration, Newton method, Numerical computation of solutions to systems of equations, system of nonlinear equations, quadratic covergence
trapezoidal rule, numerical examples, fixed point iteration, Newton method, Numerical computation of solutions to systems of equations, system of nonlinear equations, quadratic covergence
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