Skip to main content
RA_146869594-Participant
4-Participant
Sep 17, 2026 5:19 AM UTC
Solved

Odesolve within a loop

Hi,

I am trying to solve variable T_H, starting with a guess value of for example 10 kN/m. With this value z(x) is solved using Odesolve, then T_H is evaluated and a new value of 135 kN/m is found. This iteration continues until the correct value of T_H is iterated. Could someone please guide me on how to correctly implement this in Mathcad?

 

 

AlanStevensAnswer
19-Tanzanite
Sep 17, 2026 10:22 AM UTC

Here’s a way avoiding the Given Find problem:

 

View in thread

5 replies

Werner_E
Werner_E25-Diamond I
25-Diamond I
Sep 17, 2026 9:40 AM UTC

You don’t need to write the program loop for the iteration yourself - you may use a solve block with “find”. 

But first you should parametrize your solveblock, turning z into a function of T.H.

Then use this function in a second solve block with “find” to get the value of T.H.

Here is the solution done in legacy Mathcad 15 (I have no access to a full Prime version).
Solve blocks look different there, the syntax for odesolve is different and in odesolve unfortunately no units are allowed:

 

Translate
    RA_146869594-ParticipantAuthor
    4-Participant
    Sep 17, 2026 10:07 AM UTC

    Thanks for your reply Werner, unfortunately in Prime this is not working (also tried the alternative notation you purposed). I would appreciate if you have any additional suggestions. 

     

    Translate
    AlanStevens19-TanzaniteAnswer
    19-Tanzanite
    Sep 17, 2026 10:22 AM UTC

    Here’s a way avoiding the Given Find problem:

     

    Translate
      RA_146869594-ParticipantAuthor
      4-Participant
      Sep 17, 2026 10:44 AM UTC

      Thank you Alan and Werner, the problem was solved combining both your answers: 

       

      Translate
      Werner_E
      Werner_E25-Diamond I
      25-Diamond I
      Sep 17, 2026 7:37 PM UTC

      Glad you found a solution.

      I suspected that Prime would not accept z(T,x) or z’(T,x) but wasn’t sure about an alternative. I would have expected the alternate way using the 2-liner to work in Prime as well but had no way to try it myself. 
      I am a bit surprised that Prime allows z(T)’(x) - nice!

       

      Translate
      Terms & ConditionsAccessibility statement