怎么用matlab程序写二分法求方程根？

二分法在很多地方应该都会见到，这里是通过二分法迭代逼近的方法求出一个方程的根。 function xc = bisection(f,a,b,tol)% use the bisection method to find the root of the function% Page 30,computer problem 7(Bisection method)% input:% f:the function that transform from the equation% a,b:the left and