×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Solving Multiple Polynomials

Solving Multiple Polynomials

Solving Multiple Polynomials

(OP)
I am trying to write an concrete column interaction spreadsheet and I need to solve several cubic equations at once.

Should I use GOALSEEK or SOLVER?  How do I get the spreadsheet to solve more that one equation at a time?

Thanks

RE: Solving Multiple Polynomials

You should use solver. Set up a cell that contains your total RMS error for all the sub-problems, and then get solver to minimise that. You may need to apply weightings to the individual error terms.

Goal seek won't work, it can only change one cell to drive another cell towards a target value. You need to change multiple cells.

Another option that might work better is to solve each cubic individually with solver, driving that from a macro.

Cheers

Greg Locock

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! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close