The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: How to fit a sine wave to under-sampled data
Replies: 3   Last Post: Jan 7, 2013 9:38 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Scott Rauscher

Posts: 2
Registered: 12/26/12
How to fit a sine wave to under-sampled data
Posted: Dec 26, 2012 6:13 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

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?

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.