×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Cubic Spline

Cubic Spline

Cubic Spline

(OP)
I need to fit a cubic spline to a sequence of N knots (xi, yi), 1 < i < N

My xi are are distinct, in ascending order but not necessarily equally spaced. I need to write a program in Matlab to solve for the curvatures si.

Can anyone can help me on how to go around in solving this.

RE: Cubic Spline

Matlab has a Spline Toolbox. You don't fit a spline to knots, you fit it to an N-Dim set of raw data points. The knots are locations where the (cubic in your case) fitting equations are joined. No need to have ascending order either.

It's a least squared error type solution. Endpoints match, derivatives at endpoints match.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources