Hybrid method for nonlinear least-square problems without calculating derivatives

  • C. X. Xu
Contributed Papers

Abstract

This paper presents a no-derivative modification of the hybrid Gauss-Newton-BFGS method for nonlinear least-square problems suggested initially by Al-Baali and Fletcher and modified later by Fletcher and Xu. The modification is made in such a way that, in a Gauss-Newton step, the Broyden's rank-one updating formula is used to obtain an approximate Jacobian and, in a BFGS step, the Jacobian is estimated using difference formulas. A set of numerical comparisons among the new hybrid method, the Gauss-Newton-Broyden method, and the finite-difference BFGS method is made and shows that the new hybrid method combines the better features of the Gauss-Newton-Broyden method and the finite-difference BFGS method. This paper also extends to the least-square problem the finite-termination property of the Broyden method, proved for a nonsingular system of equations by Gay and for the full-rank rectangular system of equations by Gerber and Luk.

Key Words

Nonlinear least squares hybrid method Gauss-Newton method BFGS method finite-termination property 

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Copyright information

© Plenum Publishing Corporation 1990

Authors and Affiliations

  • C. X. Xu
    • 1
  1. 1.Department of MathematicsXian Jiaotong UniversityXianChina

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