Bob Phillips and maybe many others have provided a UDF like

Function HASFORMULA(rng As Range)
If rng.Count = 1 Then
HASFORMULA = rng.HASFORMULA
Else
HASFORMULA = CVErr(xlErrRef)
End If
End Function

Can this function be changed to show an array of TRUE/FALSE values
reflecting whether cells in a range holds formulas or not?

Hans Knudsen