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ptc-45783131-Visitor
1-Visitor
May 7, 2012
Question

undefined variable using find

  • May 7, 2012
  • 1 reply
  • 4654 views

Hi all

i found many discussions on this specific subject but.... I was not able to solve my problem.

I'm new with Mathcad and I'm afraid I'm doing something wrong.

Could someone please take a look at my xmcd?

Thanks

Giovanni

1 reply

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wayne12-Amethyst
12-Amethyst
May 7, 2012

I think you are missing some initial conditions , Tv and Gama1

Check each side of the bollean expressions, they should all calculate to a value with the initial guesses.

For example, cut and past the RHS of Ik/Is, type= and you will see a unit problem with the cos()

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ptc-45783131-VisitorAuthor
1-Visitor
May 7, 2012

Hi Wayne and thanks for your suggestion.

You were right (I missed some measureament units (like s or A). Now I checked all the equations and the initial guesses are working ( i'm able to see the initial value for the four equations).

Unfortunately this didn't solve the problem....I still get and undefined variable error

Thanks

Gio'

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RichardJ19-Tanzanite
19-Tanzanite
May 7, 2012

Gamma1 (LHS of last expression) is undefined.

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