Maybe this is of some help, although it's just an example

--
Kind regards,

Niek Otten
Microsoft MVP - Excel


' ================================================== =================
Function Backward(ValueToBeFound As Double, MoreArguments As Double, _
Optional ReasonableGuess, Optional MaxNumberIters, _
Optional MaxDiffPerc) As Double
€˜
€˜ Niek Otten, March 22 2006
€˜
' This EXAMPLE function goalseeks another function,
' called Forward. It works for almost any continuous function,
' although if that function has several maximum and/or minimum
' values, the value of the ReasonableGuess argument becomes
' important.
' It calculates the value for ReasonableGuess and for
' 1.2 * ReasonableGuess.
' It assumes that the function's graph is a straight line and
' extrapolates that line from these two values to find the value
' for the argument required to achieve ValueToBeFound.
' Of course that doesn't come out right, so it does it again for
' this new result and one of the other two results, depending on
' the required direction (greater or smaller).
' This process is repeated until the maximum number of calculations
' has been reached, in which case an errorvalue is returned,
' or until the value found is close enough, in which case
' the value of the most recently used argument is returned

Dim LowVar As Double, HighVar As Double, NowVar As Double
Dim LowResult As Double, HighResult As Double, NowResult As Double
Dim MaxDiff As Double
Dim NotReadyYet As Boolean
Dim IterCount As Long

If IsMissing(ReasonableGuess) Then ReasonableGuess = 1.5 ' use default
Values
If IsMissing(MaxNumberIters) Then MaxNumberIters = 20 ' that make sense in
the
If IsMissing(MaxDiffPerc) Then MaxDiffPerc = 0.001 ' context of the function

MaxDiff = ValueToBeFound * MaxDiffPerc
NotReadyYet = True
IterCount = 1
LowVar = ReasonableGuess
LowResult = Forward(LowVar, MoreArguments)
HighVar = LowVar * 1.2
HighResult = Forward(HighVar, MoreArguments)

While NotReadyYet
IterCount = IterCount + 1
If IterCount MaxNumberIters Then
Backward = CVErr(xlErrValue) 'or some other errorvalue
Exit Function
End If

NowVar = ((ValueToBeFound - LowResult) * (HighVar - LowVar) + LowVar _
* (HighResult - LowResult)) / (HighResult - LowResult)
NowResult = Forward(NowVar, MoreArguments)
If NowResult ValueToBeFound Then
HighVar = NowVar
HighResult = NowResult
Else
LowVar = NowVar
LowResult = NowResult
End If
If Abs(NowResult - ValueToBeFound) < MaxDiff Then NotReadyYet = False
Wend

Backward = NowVar

End Function
' ================================================== =================

"Jason" wrote in message
...
Well that brings up a good question. I was writing the value of a
formula
from VBA to that Cell instead of putting the formula itself in the cell

Is it possible to use GoalSeek without referencing a formula in a cell and
instead referencing a formula in VBA?

Example:
Y_F=TestVar1+TestVar1^2...
And use GoalSeek to try and get the formula Y_F down to zero by changing
TestVar1?



"Per Jessen" wrote:

Hi

Nothing seems to be wrong with the line.

What is the error description more than error 1004 ?

Do you have the formula etc. in row 1 column 201:203 ?

Hopes this helps.
....
Per

"Jason" skrev i meddelelsen
...
I am trying to use the GoalSeek function in my VBA, but am unable to get
it
to work, I have been getting 1004 error

Here is the line that seems to cause the 1004 error

Worksheets("Data Sheet").Cells(1, 203).GoalSeek Goal:=Worksheets("Data
Sheet").Cells(1, 201).Value, _
Changingcell:=Worksheets("Data Sheet").Cells(1, 202)

Please let me know if you need more info.

Thank you,

.