Running a Vba function on button press not working in excell - vba

Question

this is a simple stock price change code
my code is function(with parameters)
Function VanillaCall(S0 As Single, Exercise As Single, Mean As Single, sigma As Single, _
Interest As Single, Time As Single, Divisions As Integer, Runs As Integer) As Single
deltat = Time / Divisions
interestdelta = Exp(Interest * deltat)
up = Exp(Mean * deltat + sigma * Sqr(deltat))
down = Exp(Mean * deltat - sigma * Sqr(deltat))
pathlength = Int(Time / deltat)
piup = (interestdelta - down) / (up - down)
pidown = 1 - piup
Temp = 0
For Index = 1 To Runs
upcounter = 0
For j = 1 To pathlength
If Rnd > pidown Then upcounter = upcounter + 1
Next j
callvalue = Application.Max(S0 * (up ^ upcounter) * (down ^ (pathlength - upcounter)) - Exercise, 0) / (interestdelta ^ pathlength)
Temp = Temp + callvalue
Next Index
VanillaCall = Temp / Runs
End Function
parameters are passed from cells in excel.
i want to execute this function from button click and display return value in a cell say b12.
i have tried putting the code inside a button sub but its not working ,a call vanillacall inside sub too isnt working.
like..
private sub button1_click()
call vanillacall
end sub

Answer 1

Private Sub button1_click()
Range("B12").Value = vanillacall(....)
End Sub
As per your request, Pass arguments in Range like below. Below code is just for example (due to the changes in excel data)
Sub testing33()
Range("B12") = sample(Range("A5"), Range("B5"))
End Sub
Function sample(a As Range, b As Range)
sample = a.Cells.Value & ", " & b.Cells.Value
End Function

Answer 2

I'd do something like the below which would allow me to pick the range containing the data I want to pass to the function (as long as the range is contiguous and contains 8 cells) and pick the cell I want to output the result to.
Private Sub button1_click()
Dim inRng As Range, outRng As Range
inSelect:
Set inRng = Application.InputBox("Select Range to Calculate", Type:=8)
If inRng.Cells.Count <> 8 Then
MsgBox "Select a range with 8 cells!", vbCritical
GoTo inSelect
End If
outSelect:
Set outRng = Application.InputBox("Select Cell to Output To", Type:=8)
If outRng.Cells.Count > 1 Then
MsgBox "Select only one cell!", vbCritical
GoTo outSelect
End If
outRng.Value = VanillaCall(inRng.Cells(1), inRng.Cells(2), inRng.Cells(3), inRng.Cells(4), inRng.Cells(5), inRng.Cells(6), inRng.Cells(7), inRng.Cells(8))
End Sub

Answer 3

You need to get the values from the sheet and save in variables. Then pass the variables to the function. Then output the result to the sheet somewhere. You will need to adjust the range addresses and worksheet name as appropriate.
Private sub button1_click()
dim ws as worksheet
Set ws = worksheets("Sheet1") ' < change the sheet name as appropriate
dim S0 As Single
dim Exercise As Single
dim Mean As Single
dim sigma As Single
dim Interest As Single
dim Time As Single
dim Divisions As Integer
dim Runs As Integer As Single
S0 = ws.Range("B1") '< specify the cell that has this data
Exercise = ws.Range("B2") '< specify the cell that has this data
Mean = ws.Range("B3") '< specify the cell that has this data
sigma = ws.Range("B4") '< specify the cell that has this data
Interest = ws.Range("B5") '< specify the cell that has this data
Time = ws.Range("B6") '< specify the cell that has this data
Divisions = ws.Range("B7") '< specify the cell that has this data
Runs = ws.Range("B8") '< specify the cell that has this data
dim Result as Single
Result = vanillacall(S0, Exercise , Mean, sigma, Interest, Time, Divisions, Runs)
ws.Range("B10") = Result '<specify the cell where you want the result
end sub