need help finding convergence

Question

Tony Montgomery 2014-9-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/155512-need-help-finding-convergence

回答： Tony Montgomery 2014-9-20

I have the following equation in matlab g1=@(x) tan(exp(x/20)) now I need to run this until I get two consecutive approximations to the root are close enough or divergence is determined. here is how i'm in iterating n=0; a=1; n=n+1; x1(n)=g1(a); a=x1(n); now this does work and I can run it, but i can't make the loop until i know how to find the error between xold and xnew. So my question is how to i make this so the equation is in the form xnew=g(xold)?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Mischa Kim 2014-9-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/155512-need-help-finding-convergence#answer_152392

编辑：Mischa Kim 2014-9-20

在 MATLAB Online 中打开

Tony, this should get you started:

 g      = @(x) tan(exp(x/20));
 my_tol = 1e-5;
 x      = 1;
 dx     = x;
 x_iter = x;
 while dx > my_tol
    x_new  = g(x);
    dx     = abs(x - x_new)
    x      = x_new;
    x_iter = [x_iter x];
 end