How to find the best fit curve as a vertical scaling of another curve?

2 次查看（过去 30 天）
SojM
SojM 2021-9-20
评论： SojM 2021-9-22
I have a original graph of function f(x). Now I have few points scattered and I want to find a best fit curve through these points. But my new fit curve should be of the form n*f(x) where n is a numerical value. I want to find the value n. How can I do this? Below figure might explain the problem I am talking about. I want to fit curve n*f(x) through orange points and find out n.

请先登录，再回答此问题。

采纳的回答

David Goodmanson
David Goodmanson 2021-9-20
编辑：David Goodmanson 2021-9-20
Hi SojM,
Suppose you have points x,y for the function f(x), where x and y are column vectors. And suppose the red points are the set xr,yr, also both column vectors. Then
ynew = interp1(x,y,xr,'spline');
n = ynew\yr
If you have f(x) as an algebraic function, then the first line can be simply
ynew = f(xr)
  1 个评论
SojM
SojM 2021-9-22
Thanks. This is what I was looking for. Is there any way to put this into a for loop when x and y are same but there are multiple column vectors data (xr, yr)?

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Interpolation 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by