Fitting a line that passes through the origin (0,0) to data

Question

I have a set of points (x,y) and I need to find the line of best-fit that passes through the origin using MATLAB.

Answer 1

The best fit line, in general, passes through the centroid of the data (average the x's and average the y's). So find the centroid and plot the line from the origin through the centroid.

Answer 2

if you have the "Curve Fitting Toolbox" you can use

f = fit( x, y, 'a*x' );