MATLAB: Rotate a line profile to remove the tilt (make it horizontal)

Question

I have a profile of a line like below

I want to rotate the file to horizontal like below

Any idea how I can do that?

Actually, the above situation is just a simple example; I want to rotate the below line to horizontal:

Any idea would be appreciated!

Answer 1

Use the detrend function. Specifically see the documentation section on Continuous Linear Trend , although other examples may be relevant, depending on the result you want.