Date: Dec 26, 2012 6:13 PM
Author: Scott Rauscher
Subject: How to fit a sine wave to under-sampled data

I've poured through the forums several times and have almost found a good solution.  

I want to fit a sine wave to some under-sampled constant-frequency/phase/amplitude data. I have hundreds of data files so I need to automate it. I have used SineFit in the file exchange, and it works well most of the time, but has a tendency not to converge. I have also tried sinfapm, but the phase it gives never lines up.

What I'm trying to do is best illustrated in this picture (red is the data, blue is the sine wave I want to find):

Does anyone have suggestions on where to start for a full-proof way of doing this?