excel vba initialize entire array
'VBA function to create a 2D array with every element set
'to the same initial value:
Function Init2D(rows, cols, Optional val)
Dim i&, j&
ReDim v(1 To rows, 1 To cols)
If Not IsMissing(val) Then
For i = 1 To rows
For j = 1 To cols
v(i, j) = val
Next
Next
End If
Init2D = v
End Function
'This version uses no loops:
Function Init2D(rows, cols, Optional val = "")
Const NUMER = "index(offset(a1,,,ROWS,COLS)*0+VAL,,)"
Const ALPHA = "index(rept("""",len(offset(a1,,,ROWS,COLS))<0)&""VAL"",,)"
DoEvents
Init2D = Evaluate(Replace(Replace(Replace(IIf(IsNumeric(val), NUMER, ALPHA), "VAL", val), "ROWS", rows), "COLS", cols))
End Function
'--------------------------------------------------------------------
'10 rows, 1 column, all elements = 0:
a = Init2D(10, 1, 0)
'20 rows, 5 columns, all elements = "abc":
a = Init2D(20, 5, "abc")
'--------------------------------------------------------------------
'1D array version:
Function Init1D(elems, Optional val, Optional base = 1)
Dim i&, max&
max = base + elems - 1
ReDim v(base To max)
If Not IsMissing(val) Then
For i = base To max
v(i) = val
Next
End If
Init1D = v
End Function