Producing a line of best fit with equation

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

Answer 1

[Sebastian Castro]

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

Answer 2

[Image Analyst]

See attached demo of polyfit.

Answer 3

[Kylie Hansen]

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)

[Ryan Kunen]

h = lsline ;

p2 = polyfit(get(h,'xdata'),get(h,'ydata'),1)

[Image Analyst]

@Ryan Kunen, this is just the code @Kylie Hansen gave. Did you forget to add some comment about it?