I want to add a line of best fit to my plot using the polyfit function.

%Plot graph 1

figure(2); clf

plot(xL(A),anglex,'ko');

[darova]

Can you show something more?

[John D'Errico]

Note that the simplest way to add that line of best fit is to plot your data, then use the basic fitting tools menu item on the plot itself.

Answer 1

[Jon]

You can do something like this

p = polyfit(xL(A),anglex,1);
anglexFit = polyval(p,xL(A));
plot(xL(A),anglex,'ko',xL(A),anglexFit)

I'm assuming your variable A, is a vector of indices that give the elements of xL that you want plotted and fit.

Also you can enter the command doc polyfit on the command line and it will bring up the documentation for polyfit, which has some nice examples of plotting best fit lines.

[Jon]

Did this answer your question?

Answer 2

[Image Analyst]

See attached demo of polyfit where I fit a line and a dubic to some data.

Attach your data and show a screenshot of it plotted if you want anymore help.