Save old values in an iteration (while loop)

7 次查看（过去 30 天）

Mehdi 2015-9-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/240754-save-old-values-in-an-iteration-while-loop

回答： Walter Roberson 2015-9-8

Hi,

In Newton_Raphson iteration, I need to compare old and new values of X so that it stops when their difference is very small. How can I save old values? Thank you very much in advance.

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。

采纳的回答

Walter Roberson 2015-9-8

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/240754-save-old-values-in-an-iteration-while-loop#answer_191624

在 MATLAB Online 中打开

prev_value = inf;
while true
   new_value = .... some calculation
   if abs(prev_value - new_value) < YourTolerance
     break;
   end
   prev_value = new_value;
end