How to fit ascending data with piecewise linear function?

3 次查看（过去 30 天）
xiaojuezi
xiaojuezi 2020-10-5
编辑： Matt J 2020-10-6
Hi, I have a vector r sorted in asending order. Now I would like to fit this r with m+1 pieces, and extract the m internal points.
E.g, my data is:
r = [1,1.5,1.6,2,3,3.1,3.2,3.5]
If m = 2, then I can fit three lines to r, and the internal points are [2,3].
Is there a way to do this algorithmatically?
Thank you very much.
  1 个评论
Mathieu NOE
Mathieu NOE 2020-10-6
hello
could you please clarify what is your intention ? the internal points are supposed to correspond to the integer values in your data vector or what is the logic to choose which values are meaningfull in your linear piecewise interpolation ?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Matt J
Matt J 2020-10-6
编辑：Matt J 2020-10-6
There are some spline fitting tools on the file exchange that would be applicable:
https://www.mathworks.com/matlabcentral/fileexchange/24443-slm-shape-language-modeling
https://www.mathworks.com/matlabcentral/fileexchange/25872-free-knot-spline-approximation
Note that a piecewise linear function is a first-order spline.

类别

在 Help Center 和 File Exchange 中查找有关 Linear and Nonlinear Regression 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