Excel VBA #Value! Error

Question

I have the following function that when I run it says #value! error.

I would appreciate any help.

Function Bootstrap(S As Object, Z As Object, L As Double)

    Dim j As Integer
    Dim a() As Double
    Dim b() As Double
    Dim n As Integer
    Dim Q() As Double
    Dim sum As Double
    Dim P As Double

    ReDim a(1 To n)
    ReDim b(1 To n)
    ReDim Q(1 To n)

    dt = 1
    sum = 0
    Q(0) = 0

    For j = 1 To n - 1
        S.Cells(j, 1).Value = a(j)
        Z.Cells(j, 2).Value = b(j)
        P = Z(j) * (L * Q(j-1) - (L + dt * a(n) * Q(j))
        sum = sum + P
    Next j

    Bootstrap = sum

End Function

Bootstrapping function calculates the following value In fact I am trying to calculate this formula Q(t,Tn)=(∑(j=1)to(n-1) Z(t,Tj) [LQ(t,Tj-1)-(L+dt Sn) Q(t,Tj)]/[Z(t,Tn) (L+dt*Sn)] +(Q(t,Tn-1) L)/(L+dt Sn)

Inputs given are[S1 ,S2,….Sn ],[Z(t,T1),Z(t,T2)…..Z(t,Tn)]and and L=0.4

Answer 1

Take the habit to format and increment your code, especially before posting it!

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1. You need to type the output of the function (on the line of the function name)
2. A parenthesis is missing from the line P = Z(j) * (L*Q(j-1)-(L+ dt * a(n) * Q(j))
3. n is empty (and so are a , b and Q ) when you try to redim your arrays, so you need to define them!
4. Z(j) will also give you an error, because it is a Range, you need Z.Cells(i,j)

Try this :

Function Bootstrap(S As Range, Z As Range, L As Double) As Double
Dim j As Integer
Dim a() As Double
Dim b() As Double
Dim n As Integer
Dim Q() As Double
Dim sum As Double
Dim P As Double

n = Application.WorksheetFunction.Max(S.Columns.count, Z.Columns.count)
a = S.Value
b = Z.Value
dt = 1
sum = 0
ReDim Q(1 To n)
Q(0) = 0
'Q(1) = "??"


For j = 1 To n - 1
    P = b(1, j) * (L * Q(j - 1)) - (L + dt * a(1, j) * Q(j - 1))
    sum = sum + P
    Q(j) = sum
Next j

Bootstrap = sum
End Function

Answer 2

Try this code : entered as =Bootstrap(A1:B1,A2:B2,0.4)
I have corrected the following
- Assigning the ranges to variants
- defining dt as double
- Dim Q() as 0 to n
- using A() and b() in the formula
- the input ranges are rows not columns

Function Bootstrap(S As Range, Z As Range, L As Double) As Double
Dim j As Integer
Dim a As Variant
Dim b As Variant
Dim n As Integer
Dim Q() As Double
Dim sum As Double
Dim P As Double
Dim dt As Double

n = Application.WorksheetFunction.Max(S.Columns.Count, Z.Columns.Count)
a = S.Value
b = Z.Value
dt = 1
sum = 0
ReDim Q(0 To n)
Q(0) = 0

For j = 1 To n - 1
    P = b(1, j) * (L * Q(j - 1)) - (L + dt * a(1, j) * Q(j - 1))
    sum = sum + P
    Q(j) = sum
Next j

Bootstrap = sum
End Function