MATLAB二分法函数求根

 

function xc = bisect(f,a,b,tol)

ind = b-a;
while ind > tol
    xx = (a+b)/2;
    if f(a)*f(xx) < 0
        b = xx;
    else
        a = xx;
    end
    ind = b - a;
end
xc = xx;