Remove the first element of a VBA array

There is no direct method in VBA but you can remove the first element easily like this:

'Your existing code
'...
'Remove "ReDim Preserve matriz(1 To UBound(matriz))"
For i = 1 To UBound(matriz)
  matriz(i - 1) = matriz(i)
Next i
ReDim Preserve matriz(UBound(matriz) - 1)

There is unfortunately not. You have to write a method to do it. One good example is http://www.vbforums.com/showthread.php?562928-Remove-Item-from-an-array

'~~> Remove an item from an array, then resize the array

    Public Sub DeleteArrayItem(ItemArray As Variant, ByVal ItemElement As Long)
    Dim i As Long

    If Not IsArray(ItemArray) Then
      Err.Raise 13, , "Type Mismatch"
      Exit Sub
    End If

    If ItemElement < LBound(ItemArray) Or ItemElement > UBound(ItemArray) Then
      Err.Raise 9, , "Subscript out of Range"
      Exit Sub
    End If

    For i = ItemElement To lTop - 1
      ItemArray(i) = ItemArray(i + 1)
    Next
    On Error GoTo ErrorHandler:
    ReDim Preserve ItemArray(LBound(ItemArray) To UBound(ItemArray) - 1)
    Exit Sub
    ErrorHandler:
    '~~> An error will occur if array is fixed
    Err.Raise Err.Number, , _
    "Array not resizable."

    End Sub