polyfit and polyval problem
4 次查看(过去 30 天)
显示 更早的评论
Hi there,
I am trying to plot a line using the ployfit and command
x and y are the coordinates in attached xy the plot.
I can't plot a polyfit curve that reproduces the original.
I alway came up with something different from the original curve.
8 个评论
dpb
2019-12-6
"I got the y from a more complex equation, ..."
Well, there's the place to start. What makes sense to approximate whatever that is/was.
What restrictions are on the approximation used, if any?
采纳的回答
Paul Rogers
2019-12-6
编辑:Paul Rogers
2019-12-6
5 个评论
Guillaume
2019-12-6
I'm not sure how many times we can say it, your curve is nothing like a polynomial and attempting to fit a polynomial to it is the wrong approach.
To me it looks like your curve may be a log-normal curve. Again, some information on what created that curve could tell you that.
更多回答(0 个)
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Get Started with Curve Fitting Toolbox 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!