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Reproducing the Goal-Seek function to eliminate circular references

Last Modified: 2012-05-05
Please forgive my ignorance on the subject, but my client has just asked me about the "Goal Seek" tool in Excel.  They would like to know if the method it uses to perform its calculations can be reproduced using VBA code.  My client has made some attempts to write calculations that are like the Goal Seek function, which has resulted in circular references, which we are clear need to cleaned up.
When you respond, please include a brief description of the function and when it's useful; useful articals that describe the function with concrete examples, and any sample VBA code that performs the iterative calculations internally.  
I suspect I will become an expert on the subject before too long.  --Peter Ferber
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Mechanical Engineer
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byundtMechanical Engineer
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GoalSeek is useful if you have a single goal and need to change only one cell to reach it.

Solver is required if you need to change more than one cell to reach your goal. It may also be used when only one cell needs to be changed. Solver exposes many more choices in the method used to reach the solution than does GoalSeek.

Here is a simple macro that uses GoalSeek to find a solution:

Sub GoalSeeker()
Dim ChangeCell As Range, Target As Range
Dim Goal As Double
Set ChangeCell = [B8]
Set Target = [D8]
Goal = 5
Target.GoalSeek Goal:=Goal, ChangingCell:=ChangeCell
End Sub


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