Finding a trendline from a scatter plot

Question

Benjamin 2019-12-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495745-finding-a-trendline-from-a-scatter-plot

回答： ME 2019-12-9

采纳的回答： ME

Capture.PNG

Hello

Dear All

I need to find a trendline for a scatter plot(s) in Matlab. Unfortunately, my scatter plot(s) does not show a nice trend, or relationship between between my X's and Y. I want to know if Matlab is able to give me the best possible trendline that can be fit for that scatter plot or at least I try to fit different types of curves. Excel is able to fit a trendline (Liner, Logarithmic, Polynomial, and etc) having any scatter plot, but it seems Matlab cannot do that--at least using polyfit(X,Y,n) having n=1,2,...

attached is one of my scatter plots picture.

Thank you

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

ME 2019-12-9

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495745-finding-a-trendline-from-a-scatter-plot#answer_405595

MATLAB can do this if you make your scatter plot and then in the figure window go to "Tools -> Basic Fitting". That will then allow you to draw a bunch of different data fits onto your diagram, output the residuals, output the formulae, etc.

I'm sure there is probably a way to call this all programatically but I don't know of it.

I know there are also fitting tools in some of the MATLAB licensed toolboxes, but I don't currently have access to any of those so I can't really be much help on those.

Perhaps somebody else might be able to help with the gaps here!