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A
Adlil1-Visitor
1-Visitor
May 16, 2022
Solved

Find doesn't work in mathcad

  • May 16, 2022
  • 6 replies
  • 3355 views

Hello PTC fam, it seems the Find function doesn't work at my end. Mind to take a look? I attached my file

Adlil_0-1652684561729.png

 

Best answer by VladimirN

Before "Given" you need to specify the initial value for the variable you want to find.

 

Pic_1.png

 

6 replies

V
VladimirN24-Ruby IVAnswer
24-Ruby IV
May 16, 2022

Before "Given" you need to specify the initial value for the variable you want to find.

 

Pic_1.png

 

    A
    Adlil1-VisitorAuthor
    1-Visitor
    May 16, 2022

    Thank you for the explanation. I did what you recommend and solved it. Thanks.

    W
    Werner_E25-Diamond I
    25-Diamond I
    May 16, 2022

    if you evaluate a solve block using numeric evaluation (the "normal" =  ) you are forcing Mathcad to use numerical algorithms which require an initial guess value for the variable you are looking for, as VladimirN had shown.

     

    If you evalute the solve block symbolically, no guess value is required:

    Werner_E_0-1652691176847.png

    But  I think that In your case a numerical evaluation is more appropriate anyway.

    You may want to look up the chapter on "Solving" in the Mathcad help for more details.

    Werner_E_3-1652691683305.png

     

    You may also use the "root" command instead of a solve block with "find".  You can use "root" in two different flavors:

    Either provide an appropriate range (in the example I used the range from 1 to 10^7)

    Werner_E_1-1652691325656.png

    or you again provide a guess value before using "root"

    Werner_E_2-1652691374249.png

     

     

     

     

      L
      LucMeekes23-Emerald IV
      23-Emerald IV
      May 16, 2022

      Why not solve it symbolically, to get an exact answer:

      LucMeekes_0-1652697822945.png

       

      Success!
      Luc

      W
      Werner_E25-Diamond I
      25-Diamond I
      May 16, 2022
      @LucMeekes wrote:

      Why not solve it symbolically, to get an exact answer:

      Maybe because is doesn't look that useful when doing it in Mathcad 15 rather than in MC11 😉

      Werner_E_0-1652705698032.png

       

        V
        VladimirN24-Ruby IV
        24-Ruby IV
        May 16, 2022

        😀

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