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Apr 08, 2017
11:43 AM

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Apr 08, 2017
11:43 AM

Help! "This variable is undefined"

I'm trying to use Mathcad to solve a series of equations. I keep getting the error message "This variable is undefined" Any tips?

Solved! Go to Solution.

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Apr 10, 2017
09:22 AM

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Apr 10, 2017
09:22 AM

1) You forgot to type multiplication dots when calculating A.t * (....). If you write A.t(...) then A.t is interpreted as function.

2) You have a unit mismatch in your second equation. The first summand has to be multiplied by a length (I had simply multiplied by 1m which sure is not correct)

4 REPLIES 4

Apr 10, 2017
09:22 AM

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Apr 10, 2017
09:22 AM

1) You forgot to type multiplication dots when calculating A.t * (....). If you write A.t(...) then A.t is interpreted as function.

2) You have a unit mismatch in your second equation. The first summand has to be multiplied by a length (I had simply multiplied by 1m which sure is not correct)

Apr 11, 2017
06:35 AM

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Apr 11, 2017
06:35 AM

Thank you! Very helpful.

Apr 11, 2017
06:57 AM

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Apr 11, 2017
06:57 AM

It intrigued me that your first solve block worked but the second one didn't. I found two things from Werner's unit balance:

- , and
- You need to define A_t and A_s the same:

These, along with Werner's fixes . . .

Apr 10, 2017
09:26 AM

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Apr 10, 2017
09:26 AM