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Outputting a formula in a cell using VB

  1. #1
    Cardiff Maths Student
    Guest

    Outputting a formula in a cell using VB

    Hi!
    I am using VB to maximise a series of functions using the solver Add-In.
    Here is a part of my code:

    logsum = 0
    For l = 1 To n
    'Set the initial value of v to 1:
    Cells(k + 1, 4) = 1
    logsum = logsum + Log(1 + ((Cells(l + 1, 1).Value) ^ 2) / Cells(k + 1,
    4).Value)
    Next l
    loglikelihood = n * Log((1 / (WorksheetFunction.Pi * Cells(k + 1, 4).Value)
    ^ (1 / 2)) * (Exp(WorksheetFunction.GammaLn((Cells(k + 1, 4).Value + 1) / 2)
    - WorksheetFunction.GammaLn(Cells(k + 1, 4).Value / 2)))) - ((Cells(k + 1,
    4).Value + 1) / 2) * logsum
    Cells(k + 1, 3) = loglikelihood
    SolverOk SetCell:="$k+1$3", MaxMinVal:=1, ByChange:="$k+1$4"
    SolverAdd CellRef = "$k+1$4", Relation:=3, FormulaText:="0.000001"
    SolverSolve UserFinish:=True
    Next k

    My problem is that I want to maximise the "loglikelihood" with respect
    to the value given in cell(k+1,4) but at the moment I am outputting a number
    in Cell(k+1,3) not the formula that is used to calculate this number so
    Solver does not work. Does anyone have any suggestions how I could output the
    formula in the cells instead of the value obtained at the end?

    Thanks!



  2. #2
    Forum Moderator Leith Ross's Avatar
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    Hello Cardiff Maths Student,

    If you want to place the formula loglikelihood into Cell(K+1, 3) you have to assign the formula string to the cell's formula property.

    Assign Formula to a Cell:
    Cell(K+1, 3).Formula = loglikelihood

    Sincerely,
    Leith Ross

  3. #3
    Tushar Mehta
    Guest

    Re: Outputting a formula in a cell using VB

    To get the correct syntax to enter a formula into a cell, turn on the
    macro recorder (Tools | Macro > Record new macro...), enter the formula
    by hand, and turn off the recorder. XL will give you the necessary
    code. You can then generalize this by replacing specific cell
    addresses with addresses created programmatically.

    --
    Regards,

    Tushar Mehta
    www.tushar-mehta.com
    Excel, PowerPoint, and VBA add-ins, tutorials
    Custom MS Office productivity solutions

    In article <E9947CC0-AB1A-46F5-952B-B87632AEF7B5@microsoft.com>,
    CardiffMathsStudent@discussions.microsoft.com says...
    > Hi!
    > I am using VB to maximise a series of functions using the solver Add-In.
    > Here is a part of my code:
    >
    > logsum = 0
    > For l = 1 To n
    > 'Set the initial value of v to 1:
    > Cells(k + 1, 4) = 1
    > logsum = logsum + Log(1 + ((Cells(l + 1, 1).Value) ^ 2) / Cells(k + 1,
    > 4).Value)
    > Next l
    > loglikelihood = n * Log((1 / (WorksheetFunction.Pi * Cells(k + 1, 4).Value)
    > ^ (1 / 2)) * (Exp(WorksheetFunction.GammaLn((Cells(k + 1, 4).Value + 1) / 2)
    > - WorksheetFunction.GammaLn(Cells(k + 1, 4).Value / 2)))) - ((Cells(k + 1,
    > 4).Value + 1) / 2) * logsum
    > Cells(k + 1, 3) = loglikelihood
    > SolverOk SetCell:="$k+1$3", MaxMinVal:=1, ByChange:="$k+1$4"
    > SolverAdd CellRef = "$k+1$4", Relation:=3, FormulaText:="0.000001"
    > SolverSolve UserFinish:=True
    > Next k
    >
    > My problem is that I want to maximise the "loglikelihood" with respect
    > to the value given in cell(k+1,4) but at the moment I am outputting a number
    > in Cell(k+1,3) not the formula that is used to calculate this number so
    > Solver does not work. Does anyone have any suggestions how I could output the
    > formula in the cells instead of the value obtained at the end?
    >
    > Thanks!
    >
    >
    >


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