xjf.asv

为配套王能超版本数值分析简明教程编写,方便学生教师演示!

function xjf(x,y,e,f)
f1=inline(f);
xx=linspace(x,y,100);
syms t
%f2=inline(f)
for i=2:100;
    yy(i)=(f(xx(i))-f(xx(1)))/(xx(i)-xx(1));
end
if yy~=ones(1,99);
   for i=2:100;
       yy1(i)
    



function newton(x,y,e,f)
syms t
f1=inline(f);
xx=linspace(x,y,100);
f2=diff(f1(t));
f5=inline(f2);
yy=f5(xx);
if yy~=zeros(1,100);
    syms t2
    f3=inline(t2-f1(t2)/f5(t2));
    syms t1
    y1=diff(f3(t1));
    f2=inline(y1);
    xx1=linspace(x,y,100);
    s=abs(f2(xx));
    s1=zeros(1,100);
    s2=ones(1,100);
    if s>s1 & s<s2;
        i=1;
        while abs(x-y)>e;
            x=y;
            y=f3(x);
            i=i+1;
            fprintf('%d%13.8f\n',i,y);
        end
    else 
        disp('此多项式不能进行迭代');
    end
end