excelColLetters.RdCreates a vector of spreadsheet-style letter-names corresponding to column numbers
excelColLetters(columnIndices)a character vector corresponding to the spreadsheet column headings
This is the inverse function of excelCol
## Find the column numbers for excel columns AB, CE and BB
colIndices <- excelCol(AB,CE,bb)
## Go back to the column names
excelColLetters(colIndices)
#> 28 83 54
#> "AB" "CE" "BB"