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ptc-67445311-Visitor
1-Visitor
Nov 11, 2014 6:32 AM UTC
Solved

Find Block (solutions with units)

Hey, I am unable to solve my find block. I've defined my 2 equations, with a total of 2 unknowns, and have initial guesses for both. When I try to solve for the 2 variables, it says that my find function is undefined.

Anyway to solve this?

Im using mathcad 15. thanks

In the file, its under "Analysis".

Werner_E
Werner_EAnswer
25-Diamond I
Nov 11, 2014 6:56 AM UTC

Mathcad does not allow for values of different dimension in one vector. The result your solve block would yield is a vector consisting of one unitless value (angle alpha) and one value of length (depth) so you cannot display that vector using the equal sign.

But you can assign the result to a vector with two variable names and evaluate those later one by one:

1.png

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6 replies

Werner_E
Werner_E25-Diamond IAnswer
25-Diamond I
Nov 11, 2014 6:56 AM UTC

Mathcad does not allow for values of different dimension in one vector. The result your solve block would yield is a vector consisting of one unitless value (angle alpha) and one value of length (depth) so you cannot display that vector using the equal sign.

But you can assign the result to a vector with two variable names and evaluate those later one by one:

1.png

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ValeryOchkov24-Ruby IV
24-Ruby IV
Nov 11, 2014 10:25 AM UTC

Werner Exinger wrote:

Mathcad does not allow for values of different dimension in one vector.

Sorry.

Mathcad 15 does not

Prime allows

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Werner_E
Werner_E25-Diamond I
25-Diamond I
Nov 11, 2014 10:56 AM UTC

Valery Ochkov wrote:

Werner Exinger wrote:

Mathcad does not allow for values of different dimension in one vector.

Sorry.

Mathcad 15 does not

Prime allows

Correct, and we are dealing with Mathcad 15 here.

BTW, for me Prime is not Mathcad.

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ViktorKorobov1-Visitor
1-Visitor
Nov 11, 2014 6:57 AM UTC

Calvin,

Fuction FIND in Mathcad 15 can not return a vector with different units.

See solution this problem in attached file.

Viktor

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Werner_E
Werner_E25-Diamond I
25-Diamond I
Nov 11, 2014 7:03 AM UTC

You won't need to "get rid"/divide by rad as basically its not a unit, its 1.

Furthermore, if you omit the evaluation equal sign after the Find command you don't need to remove and later add again the unit meter either.

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ViktorKorobov1-Visitor
1-Visitor
Nov 11, 2014 7:22 AM UTC

You're right, Werner. Thank you.

Viktor

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