Steinhart-Hart equation and a dataset

30 次查看（过去 30 天）
Joel22
Joel22 2020-10-29
评论： Wilmer Schroer 2021-2-4
I have a set of 21 data points of tempurate(T) and resistance(R). I need to calculate the coefficients for the Steinhart-Hart equation:

请先登录，再回答此问题。

回答（1 个）

Rishabh Mishra
Rishabh Mishra 2020-11-4
Hi,
Based on your description of the issue, I would like to make some assumptions stated below:
  • R = Column vector consisting resistance values
  • T = Column vector consisting temperature values
  • A,B,C = co-efficient of the equation
Use the code below:
p = polyfit( log(R) , 1./T , 4);
p(4), p(3) & p(1) are the calculated values for A, B & C respectively.
Hope this helps.
  2 个评论
Wilmer Schroer
Wilmer Schroer 2021-2-4
This answer is false. The Steinhart-Hart equation has no 2nd degree polynominal. When you use polyfit, it will fit a curve with the first, second, third and fourth polynominal. The resulting fit is thus not the Steinhart-Hart fit but just a regular 4th degree polynominal fit.
When using polyfit, you should use polyfit(log( R ), 1./T, 3). This is because it calculates N+1 polynomials instead of N (so N has to be three).
Wilmer Schroer
Wilmer Schroer 2021-2-4
I suggest you use the cftool add on and fit a custom function

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

Community Treasure Hunt

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

Start Hunting!

Translated by