Forum Discussion

Bart963's avatar
Bart963
Copper Contributor
Jan 25, 2023

Itteration error

I have made a calculation sheet for work, with an iteration in it, that works. Only to crash when a parameters switches between "Yes" or "No". 

 

Now when K82 changes between "Ja" and "Nee"  (Yes or No) the iteration doesn't work anymore as shown below

 

So the issue occures in K75 & K81. It gives an #WAARDE error (#VALUE error). And I don't know why it is doing this.
I have used an IF function in both those cells, so that when K82=Yes -> "does not apply"

Any suggestions on how I can get this working again? so when K82 changes, the itteration functions keep working.

 

Iteration Functions:

v_1 (K75) = IF(K82="Nee";1-(SIN(4*PI()*fTpi-2*Gamma)+SIN(2*Gamma))/(4*PI()*fTpi)+(f*Tau)/fTpi*(1-EXP(-(2*fTpi)/(f*Tau)))*SIN(Gamma)^2-(8*PI()*f*Tau*SIN(Gamma))/(1+(2*PI()*f*Tau)^2)*((2*PI()*f*Tau*(COS(2*PI()*fTpi-Gamma)/(2*PI()*fTpi))+SIN(2*PI()*fTpi-Gamma)/(2*PI()*fTpi))*EXP(-(fTpi/(f*Tau)))+(SIN(Gamma)-2*PI()*f*Tau*COS(Gamma))/(2*PI()*fTpi));"N.v.t")

 

fTpi (K81) = IF(K82="Nee";v_1/WORTEL(v_2);"N.v.t")

 

I hope it's somewhat clear, and thanks in regards.

Bart

 

 

excel
Formulas and Functions
User Adoption

3 Replies

Sort By
  • HansVogelaar's avatar
    HansVogelaar
    MVP
    Jan 25, 2023

    Bart963 

    Could you attach a small sample workbook demonstrating the problem (without sensitive data), or if that is not possible, make it available through OneDrive, Google Drive, Dropbox or similar?

      • HansVogelaar's avatar
        HansVogelaar
        MVP
        Jan 25, 2023

        Bart963 

        I cannot get the calculation to work at all. If I change the iterative calculation parameters, I sometimes get #DIV/0! (in Dutch #DEEL/0!), but mostly #VALUE!, never a number.

         

        And I'm afraid the formula for v2 is far too complicated (for me) to analyze.

        As an alternative, here is a macro that performs an iterative calculation:

        Sub Recalc_fTpi()
    Const Precision = 0.0001
    Dim Test As Double
    Application.ScreenUpdating = False
    Application.EnableEvents = False
    If Range("M12").Value = "Nee" Then
        Range("fTpi").Value = 10
        Do
            Test = Range("v_1").Value / Sqr(Range("v_2").Value)
            Range("fTpi").Value = (Test + Range("fTpi").Value) / 2
        Loop Until Abs(Test - Range("fTpi").Value) < Precision
    Else
        Range("fTpi").Value = "N.v.t."
    End If
    Application.EnableEvents = True
    Application.ScreenUpdating = True
End Sub

Resources