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

Mathcad Prime 2.0 - 3 Equations - 3 Unknowns

Mathcad Prime 2.0 - 3 Equations - 3 Unknowns

Mathcad Prime 2.0 - 3 Equations - 3 Unknowns

I am trying to set up a program that solves 3 equations for 3 unknowns to determine my directional stresses in the attached equation. I know r1, r2, and phi, and I am trying to solve for rx, ry, and Txy. Please see attached.

Is there a way in Mathcad Prime 2.0 to set up 3 equations for 3 unknowns and have it solve?

Thank you.
Replies continue below

Recommended for you

RE: Mathcad Prime 2.0 - 3 Equations - 3 Unknowns

For a quick answer I would solve numerically using the minerr function as suggested.

If you need a symbolic answer first simplify the equation for phi. Symbolic solvers don't like absolute functions. Solve for the positive case and then the negative case. I will try this problem later on tonight. BTW, I use Mathcad 13 and wxMaxima.

I use Given = Find for symbolic solutions too not just numerical ones.
I solve a lot of system of equations but most are simple polynomials. My gut tells me the symbolic answer is going to be mess.

Peter Nachtwey
Delta Computer Systems

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


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