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Need help with find a value

basyarulh
4-Participant

Need help with find a value

I am trying to solve an equation using find but it seems not working. it says that "this variable is undefined". Really appreciate your help. The file is attached.

1542354233946.jpg

4 REPLIES 4

With Find you need a Given, together with an initial guess for M.  However, that still doesn't seem to work here (doesn't want to converge to a solution.  Luckily this is easy to represent as a quadratic which is simple to solve:

 

quadratic.PNG

 

Alan

You can get it to work with Given Find by first dividing through by (0.8SMYS)^2.  (Note: you also need to make sigma.h multiply the third term.  As originally written it had no multiply sign, so MCAD thought the third term was a function.)

 

howto.PNG

Alan

 

Hi,

 

Here is the solve block to get same answer.

Capture.JPG

Cheers

Terry

Hi,

Oops forgot the file.

Cheers Terry

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