"Find" Output Notation

[smyth13]

I have a simple question regarding the mathematical syntax of my "Find" output. I am trying to solve a system of three equations symbolically and I am getting a parametric conditional solution I believe. The mathematical syntax is not exactly clear to me (although I am a newbie to the Mathcad world). Please see the attached. Thanks

 

[IRstuff]

the actual file would be 1000x better than a picture of a file.

Nonetheless, you appear to be adding a program to the Find? Have you read the help file? It explains what you need to do, and even has a live example.

TTFN

FAQ731-376

 

[smyth13]

Thanks for the reply. I am not trying to include a program into the Find command, I am only trying to understand what the solution output is implying. I understand that "_t" is a Mathcad variable indicating infinite solutions, etc. but this particular output is causing me some confusion.

I have included the actual file. My ultimate goal is to obtain the three unknowns symbolically. Thanks.

 

[IRstuff]

According to your equations L has nothing whatsoever to do with R or theta.

You should expect to get an infinite number of solutions, because of theta.

Seems to me that this particular problem is rather easy to solve by hand and not worth grinding away with the symbolic solver.

TTFN

FAQ731-376

 

[JeffPW]

I would suggest you turn your computer off and try a pencil and a piece of paper. L can be solved for independently in the third equation. The solution for theta and Rx in the first two equations is trivial. Common sense is cheaper than a Mathcad licence.

Jeff W

http://www.p-over-a.co.uk

 

[smyth13]

Yes. I understand how to solve the equations by hand. This is a snippet of a larger set of equations that are not trivial.

You are not answering my question, my question is what exactly does the Mathcad syntax mean? I understand the linear alegbra, but I am not understanding the "_t1 - _t4" variables output by Mathcad.

A simple answer to my question would be appreciated and not a condescending remark about common sense.

 

[JeffPW]

From the jpg and mathcad files you provided you are trying to solve for three variables (theta, Rx and L) and assign the result to one variable. The attached Mathcad file shows how to solve the three equations you provided using the solve block. I solved this using Mathcad and then noticed the same thing that IRstuff pointed out.

Jeff W
www.p-over-a.co.uk

 

[IRstuff]

Is this for school?

TTFN

FAQ731-376

 

[smyth13]

Sorry I was trying to place the result into an array and not one variable. As I said I am new to the syntax of Mathcad and was just curious as to what the result was telling me about the infinite solutions. I understand if I insert numerical values that I will obtain an answer, but I just do not understand what the symbolic output is telling.

This is not a homework problem. My goal is the determination of an applied force's angle of action. In reality there are multiple points of contact and the problem is indeterminate so I was attempting to use Mathcad to iterate to a solution symbolically if possible. The attached file was a simplification of my actual problem. It appears I have not posed my question properly.

 

[IRstuff]

Why do you need a symbolic solution? Something that's indeterminant will probably not yield a symbolic solution anyway; isn't that the essence of indeterminancy?

TTFN

FAQ731-376