Loop With Solver VBA

Question

Hi I have the following code which runs a single optimisation through solver which I would like to run in a loop. the single run code is:

    Sub Macro4
SolverReset
    SolverOk SetCell:="$D$36", MaxMinVal:=2, ValueOf:="0", ByChange:="$D$7:$R$7"
    SolverAdd CellRef:="$S$7", Relation:=2, FormulaText:="1"
    SolverAdd CellRef:="$D$7:$R$7", Relation:=1, FormulaText:="$D$6:$R$6"
    SolverAdd CellRef:="$D$7:$R$7", Relation:=3, FormulaText:="$D$5:$R$5"
    SolverAdd CellRef:="$D$37", Relation:=2, FormulaText:="$D$41"
    SolverOk SetCell:="$D$36", MaxMinVal:=2, ValueOf:="0", ByChange:="$D$7:$R$7"
    SolverSolve UserFinish:=True
    SolverFinish KeepFinal:=1


    Range("D37").Select
    Selection.Copy
    Range("E41").Select
    ActiveSheet.Paste
    Range("D36").Select

Application.CutCopyMode = False
Selection.Copy
Range("F41").Select
ActiveSheet.Paste
Range("D36").Select


Range("D7:R7").Select
Application.CutCopyMode = False


   Selection.Copy
    Range("I41").Select
    ActiveSheet.Paste
End Sub

The solver optimises to a value in $D$41 (amongst other constraints)and then pastes the solutions by copying a couple of individual cells and an array and then pasting them alongside the original target cell (i.e. into row 41.) This works well. However I am trying to get it to run for a column of target cells by getting it to optimise to each cell in the column in turn, by using a loop (or better alternative), before pasting the solutions alongside it as it does for the single run code. For example I am trying to merge it with the following code

    Sub Complete()
'
'
'
Dim Count As Double
Dim Count2 As Integer
Dim increment As Double
increment = Range("C43").Value
strt = Range("C41").Value
fnsh = Range("C42").Value

    For Count = strt To fnsh Step increment
        Count2 = Count / increment
        Range("D41").Offset(Count2, 0) = Count
    Next Count
End Sub

which generates the column of target values (from strt to fnsh using increment) for Solver to take and use instead of (I think!!!) the part that says FormulaText:="$D$41". However I run into various errors and complaints (method 'Range' of Object'_Global'failed- which highlights the line "Range(E41+Count").Select. The complete code I have is:

`Sub Macro5()
   Dim Count As Double
Dim Count2 As Integer
Dim increment As Double
increment = Range("C43").Value
strt = Range("C41").Value
fnsh = Range("C42").Value

For Count = strt To fnsh Step increment
        Count2 = Count / increment
        Range("D41").Offset(Count2, 0) = Count

    SolverReset
    SolverOk SetCell:="$D$36", MaxMinVal:=2, ValueOf:="0", ByChange:="$D$7:$R$7"
    SolverAdd CellRef:="$S$7", Relation:=2, FormulaText:="1"
    SolverAdd CellRef:="$D$7:$R$7", Relation:=1, FormulaText:="$D$6:$R$6"
    SolverAdd CellRef:="$D$7:$R$7", Relation:=3, FormulaText:="$D$5:$R$5"
    SolverAdd CellRef:="$D$37", Relation:=2, FormulaText:="$D$41:$D$41+Count"
    SolverOk SetCell:="$D$36", MaxMinVal:=2, ValueOf:="0", ByChange:="$D$7:$R$7"
    SolverSolve UserFinish:=True
    SolverFinish KeepFinal:=1


    Range("D37").Select
    Selection.Copy
    Range("E41+Count").Select
    ActiveSheet.Paste
    Range("D36").Select
    Application.CutCopyMode = False
    Selection.Copy
    Range("F41+Count").Select
    ActiveSheet.Paste

    Range("D7:R7").Select
    Application.CutCopyMode = False
    Selection.Copy
    Range("I41+Count").Select
    ActiveSheet.Paste

Next Count 
End Sub` 

I just need it to update which cell it is optimising to (and putting it in the constraint of solver), then updating which cells to copy and where to paste them. Any help would be greatly appreciated.

Answer 1

Range("E41+Count").Select

This is improper syntax. The following is preferred:

Range("E41").Offset(Count,0).Select

or you could use

Range("E" & 41 + Count).Select

In general, avoid using Range without the sheet name in front of it. Also, only Select when you need to, and that's almost never. Here's an example that doesn't use any Select methods.

Sub Complete()

    Dim lStrt As Long, lFnsh As Long
    Dim lCount As Long, lCount2 As Long
    Dim lIncrement As Long

    For lCount = lStrt To lFnsh Step lIncrement
        lCount2 = lCount / lIncrement

        Sheet1.Range("D41").Offset(lCount2, 0).Value = lCount

        SolverReset
        SolverOk SetCell:="$D$36", MaxMinVal:=2, ValueOf:="0", ByChange:="$D$7:$R$7"
        SolverAdd CellRef:="$S$7", Relation:=2, FormulaText:="1"
        SolverAdd CellRef:="$D$7:$R$7", Relation:=1, FormulaText:="$D$6:$R$6"
        SolverAdd CellRef:="$D$7:$R$7", Relation:=3, FormulaText:="$D$5:$R$5"
        SolverAdd CellRef:="$D$37", Relation:=2, FormulaText:=Sheet1.Range("D41").Offset(lCount2, 0).Address
        SolverOk SetCell:="$D$36", MaxMinVal:=2, ValueOf:="0", ByChange:="$D$7:$R$7"
        SolverSolve UserFinish:=True
        SolverFinish KeepFinal:=1

        Sheet1.Range("E41").Offset(lCount2, 0).Value = Sheet1.Range("D37").Value
        Sheet1.Range("F41").Offset(lCount2, 0).Value = Sheet1.Range("D36").Value
        Sheet1.Range("D7:R7").Copy Sheet1.Range("I41").Offset(lCount2, 0)

    Next lCount

End Sub

Answer 2

Lets take into consideration part of the first line from your base solver code. There is:

SolverOk SetCell:="$D$36" 'and so on...

Wherever you have any address in Solver parameters you should pass there address instead of value (which could be quite intuitive but its not working). Therefore you would do something like this:

SolverOk SetCell:=Range("$D$36").Address '... structure ok

but not:

SolverOk SetCell:=Range("$D$36").Value   '... wrong structure

Than you need to improve your loop in that direction. If it doesn't help you please provide complete code of what you have.