5 point differentation in Matlab

2012 9 4
1 个回答
回答已采纳
更新时间：2022 10 28
9 次查看（30 天）

0 个投票

Hi,
Can anyone please guide me as to how to perform 5 point differentiation n Matlab, what does 5 point differentiation mean?
Thanks

7 个评论
显示 5更早的评论 隐藏 5更早的评论

Matt Tearle
Matt Tearle 2012-9-4
5 points to Matt Fig!
Usman
Usman 2012-9-5
Brother, it did not help me out. i need exact equation or Matlab function for it. All google gave was some equation including some value "h" which i didnt understand. Would appreciate if you can help out instead of TAUNTING. Thank You
Matt Fig
Matt Fig 2012-9-5
Nobody meant to taunt you, Usman. The link I pasted above has the exact formula for 1-D and also explains what h is:
"In one dimension, if the spacing between points in the grid is h, then the five-point stencil of a point x in the grid is..."
So you just need to pick a small value for h (the distance between each of the 5 points on the curve). Once you start writing code, post it and I am certain you will get more help.
Jan
Jan 2012-9-5
@Usman: You asked for a term, Matt Fig showed you how to find its definition and the short period of time means a friendly suggestion to ask Google by your own the next time. If you even want a Matlab implementation, you can ask Google again for "Matlab 5 point differentation". If you are still not satisfied, ask a specific question.
Matt Tearle
Matt Tearle 2012-9-5
There's a tutorial that might help here...
Usman, note the tags that have been added... See what the tutorial says about those...
You asked what 5-pt differentiation means, and Matt showed that a quick search will provide the answer. As to implementing it in MATLAB, maybe you should provide a starting point so that we can help you. Otherwise, it looks a bit like you expect random volunteers on the internet to do your work/homework for you.
Usman
Usman 2012-9-5
移动：Rik 2022-10-28
Thanks alot friends. but i certainly did google the term matlab implementation of 5 point difference and go no satisfactory result. that is why i came over here to help. if you think i want free volunteers to do my work for me, its better you dont reply back to the answer instead of passing senseless comments

请先登录，再进行评论。

请先登录，再回答此问题。

 采纳的回答

Star Strider
Star Strider 2012-9-5
编辑：Rik 2022-10-28

0 个投票

Here are a couple links that explain it about as clearly as possible:
Numerical differentiation formulas (Gives an example using a 4-point first derivative)
and:
Numerical differentiation
Note that if f(x) is the function you are differentiating (here the numerical data you have), h is the step size, that is:
h = x(k + 1) - x(k);
I have experimented with the algorithm for the 5-point first derivative. It is easy to implement, accurate, and reasonably precise.

3 个评论
显示 1更早的评论 隐藏 1更早的评论

Rik
Rik 2022-10-28
I edited the links to point to the Wayback Machine from around the time of the post. The current version of the website seems to result in a browser warning and a 404.

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 File Operations 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