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Producing a line of best fit with equation

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badfish66
badfish66 2016-4-24
评论： Image Analyst 2021-12-10
Hi
I have been using lsline to produce a linear line of bext fit for two datasets. I was wondering if there was a similar command that produced the line of best fit and provided an equation (in the form y=mx+c) for said line.
Many Thanks

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采纳的回答

Sebastian Castro
Sebastian Castro 2016-4-24
There is also the polyfit function in MATLAB. If you specify an order of 1, the output of polyfit will have the two components m and c as you specified.
http://www.mathworks.com/help/matlab/ref/polyfit.html
- Sebastian

更多回答（2 个）

Image Analyst
Image Analyst 2016-4-24
See attached demo of polyfit.
Kylie Hansen
Kylie Hansen 2017-2-16
编辑：Image Analyst 2021-12-10
Thought I'd share an alternate answer from this github repository:
https://github.com/kykyelric/Marking-Points-Above-Line-of-Best-Fit/blob/master/lsline%20equation
The code below prints a 1x2 matrix where the first value is the slope of the line and the second is the y-int.
Just plug into slope intercept form (y = mx+ b) and you've got the equation.
h = lsline ;
p2 = polyfit(get(h,'xdata'),get(h,'ydata'),1)
  2 个评论
Ryan Kunen
Ryan Kunen 2021-12-10
h = lsline ;
p2 = polyfit(get(h,'xdata'),get(h,'ydata'),1)
Image Analyst
Image Analyst 2021-12-10
@Ryan Kunen, this is just the code @Kylie Hansen gave. Did you forget to add some comment about it?

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