非线性方程求根的理论讲解，包括Newton s Method, The Secant Method, Brent s Method-Methods for Solving Nonlinear Equations ：Newton s Method, The Secant Method, Brent s Method

This function computes the LP guided modes of a step-index optical fiber using Matlab s "fzero" function available in the Matlab s Symbolic Toolbox. The "fzero" function uses Brent s method to find the root of a continuous function of one variable gi