as_excel_formula_column coerce a specified column into an Excel formula to be
used in openxlsx::writeFormula() or openxlsx::writeData().
This transformation allows to avoid issue of Excel formula being interpreted
as normal text by Excel.
as_excel_formula_column coerce a specified column into an Excel formula to be
used in openxlsx::writeFormula() or openxlsx::writeData().
This transformation allows to avoid issue of Excel formula being interpreted
as normal text by Excel.