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Werner_E
Werner_EAnswer
25-Diamond I
August 14, 2018

Use a numeric solve block and solve for theta AND F.N.

It might be helpful to add a constraint like 0<theta<pi/2.

 

Its the very same as shown here: https://community.ptc.com/t5/PTC-Mathcad-Questions/Solve/m-p/559677/highlight/true#M181249

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4 replies

Werner_E
Werner_E25-Diamond IAnswer
25-Diamond I
August 14, 2018

Use a numeric solve block and solve for theta AND F.N.

It might be helpful to add a constraint like 0<theta<pi/2.

 

Its the very same as shown here: https://community.ptc.com/t5/PTC-Mathcad-Questions/Solve/m-p/559677/highlight/true#M181249

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    kenan21-VisitorAuthor
    1-Visitor
    August 14, 2018

    Thx very much I think I know how to solve these equations know! 😄

    Is solve block the best way to solve 2 equations with 2 unknowns ?  

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    Fred_Kohlhepp23-Emerald I
    23-Emerald I
    August 14, 2018

    We have been taught that you must have the same number of equations as you have unknowns or a problem will not have a unique solution.  Many problems ((your theta problem, for example) can be solve by simple algebraic manipulation.  (You use one equation to eliminate a "variable" (Fn) from the second, leaving only one variable and constants. 

     

    We later learned that there was a matrix form of this that would solve it.

     

    There are, however, forms of equations that resist/defy manipulation like that.  For those situations we can use a solve block, and let Mathcad employ proven optimization techniques to find the solution.  So you may use a solve block to solve all 2 variable/2 equation problems; but that does not mean it's always the "best" way.

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      Fred_Kohlhepp23-Emerald I
      23-Emerald I
      August 14, 2018

      How about a little basic high school algebra and trig?

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