Linear Fit and Axes Labeling

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Suyapa Gonzalez
Suyapa Gonzalez on 22 Jun 2015
Answered: Star Strider on 22 Jun 2015
I've created a scatter plot, but I also want the linear fit of this plot. Is there a command for this. Also, how can I label both axes and add a title to the plot?

Answers (2)

Christiaan
Christiaan on 22 Jun 2015
Dear Suyapa,
There are may possible ways to plot a linear fit in a scattered plot (with least squares for example). This is also called linear regression. Therefore in MATLAB you can use one of the linear regression tools.
You can have a look at the examples, and then I am sure you find one that suits your problem.
Kind regards, Christiaan

Star Strider
Star Strider on 22 Jun 2015
There are several ways to do what you want. If you have the Statistics Toolbox, consider the lsline function.
Otherwise, consider polyfit (and polyval) with a first-degree polynomial:
b = polyfit(x, y, 1);
yf = polyval(b, x);
then plot it as:
figure(1)
scatter(x, y)
hold on
plot(x, yf)
hold off
title('Scatterplot of (x,y) data')
xlabel('x data')
ylabel('y data')
This works best if your x-data are ordered.
See the documentation for the plot function for other options.

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