function xia329(a,b,j,f3)
f=inline(f3);

y=f1(x)
y=diff(f(x));
f1=inline(y);

%y=f2(x)
%syms x1
%y1=inline(f1(x1));
%y=y1(x);

xx=linspace(a,b,100);
    s=abs(f2(xx));
    s1=zeros(1,100);
    s2=ones(1,100);
    if s>s1 & s<s2;
        i=1;
        while abs(a-b)>j;
            a=b;
            b=f(a);
            i=i+1;
            fprintf('%d%13.8f\n',i,b);
        end
    else 
        disp('此多項(xiàng)式不能進(jìn)行迭代');
    end