how to get the equation of lsline

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farfar
farfar 2017-2-11
回答： Kylie Hansen 2017-2-16
hi. I have two set of data and I want to get the linear regression. after plotting the data, im using lsline to obtain the regression line but how can I get the equation too ? thanks !

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Star Strider
Star Strider 2017-2-11
You have to calculate it, but that is not difficult.
Example:
figure(1)
scatter(1:10, rand(1, 10))
hl = lsline;
B = [ones(size(hl.XData(:))), hl.XData(:)]\hl.YData(:);
Slope = B(2)
Intercept = B(1)

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Kylie Hansen
Kylie Hansen 2017-2-16
Thought I'd post an alternative answer from this github repository: https://github.com/kykyelric/Marking-Points-Above-Line-of-Best-Fit/blob/master/lsline%20equation
The below code prints a 1x2 matrix where the first value is the slope and the second is the y-int.
h = lsline;
p2 = polyfit(get(h,'xdata'),get(h,'ydata'),1)

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