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3-Visitor

## Solving / Rearranging equations

I'm trying to solve the attached equation for T.

W, U, V, Theta and Phi are all defined values.

I can't seem to get solve,T to work. It just says undefined.

I can partially do it by breaking it down but I get to the final step and cant seem to get Mathcad to rearrange in terms of T.

9 REPLIES 9
21-Topaz I
(To:NSingleton)

Hi,

You can now upload your prime sheet rather than a picture of the problem.

Cheers Terry

Thanks,  I've uploaded my sheet for those who wish to help.

23-Emerald I
(To:NSingleton)

Hmmm!

Without defining values:

3-Visitor
(To:Fred_Kohlhepp)

Many Thanks to those who have suggested solving it before I define my variables I've now got the solve,T to work, but how to do I now put my variables in?  If I move it below any of my variables it's undefined again!  Its quite a simple mathematical sum that I've done hundreds of times on paper, hence my wanting to automate it in MathCAD,  I would have though MathCAD could solve it quite straight forwardly.

23-Emerald I
(To:NSingleton)

16-Pearl
(To:NSingleton)

Fred's approach works.  Or you can just paste the solution as a new equation (T:= ...)  and use it below your variables.  Normally I do my derivations in an appendix and just have the final equations in my calculation zones.   Note, this isn't automatic and could create an error if you make changes without updating everything.

3-Visitor
(To:DJF)

Thanks, that's is a good idea, the formula is not going to change once its rearranged, and I think i'll use the other suggestions to run a check, just in case.

16-Pearl
(To:NSingleton)

It solves in 4.0.  You state that your variables are defined.  Don't define before symbolic solving - do it after.  It may be that it's trying to do something that doesn't mathematically make sense with your values. But you can get an answer symbolically.

24-Ruby V
(To:NSingleton)

Would this help?

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