Hi, I have created the Boolean function below to evaluate if a given cell in an Excel file contains a formula. I have to process hundreds of excel files and I want to filter out any cells that contain formulae. Now I want to use the isXlsFormula function below when I loop through all the cells of a sheet, and all sheets of an excel file. For this, it would be very convenient if I could use the alternative R1C1 excel reference style, instead of the alphabetic style, as shown below. Is this possible? library(rcom) isXlsFormula <- function(cellref="A1") { excel <- comGetObject("Excel.Application") sheet <- comGetProperty(excel, "ActiveSheet") cell <- comGetProperty(sheet, "Range", cellref, cellref) isformula <- comGetProperty(cell, "hasFormula") return(isformula) } isXlsFormula() # returns TRUE if cell A1 (R1C1) contains a formula, FALSE otherwise. Thank you in advance. Cheers!! Albert-Jan ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ All right, but apart from the sanitation, the medicine, education, wine, public order, irrigation, roads, a fresh water system, and public health, what have the Romans ever done for us? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [[alternative HTML version deleted]]