how to take the derivative of the function saved from curve fitting tool

16 次查看（过去 30 天）
zein
zein 2021-3-1
评论： Simon Allosserie 2021-3-3
I want to take the derivative of the following function after extracting the curve fitted from cftool. I have saved the curve fitted curve to my workspace.
I want to know how to get the highest slope (derivate) of the curve with respect to x-data ?

请先登录，再回答此问题。

回答（1 个）

Simon Allosserie
Simon Allosserie 2021-3-1
编辑：Simon Allosserie 2021-3-1
If you have the values of your fitted curve saved, you can calculate the first derivative by using the gradient function: https://nl.mathworks.com/help/matlab/ref/gradient.html For example
fx = gradient(x) %calculate first derivative of the vector x containing your curve data.
Hope this works :)
  4 个评论
显示 2更早的评论
zein
zein 2021-3-3
I used the equation, but the max slope was increasing with decreasing the step until certain limit then the max slope become constant. I think that is normal, right?
Simon Allosserie
Simon Allosserie 2021-3-3
As per the definition of a slope, this is indeed normal. It is literally called "derivatve" because ultimately it determines the slopes over a infinitesimal x-step. So yes, once it converges to a constant value that should be right I think!

请先登录，再进行评论。

类别

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

标签

产品


版本

R2020a

Community Treasure Hunt

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

Start Hunting!

Translated by