Convert Roman Numerals to Integers
Convert roman numerals to integers
RomanToInt(x)
x |
character vector containing roman numerals |
This functon will convert roman numerals to integers without the upper bound imposed by R (3899), ignoring case.
A integer vector with the same length as roman. Character
strings which are not valid roman numerals will be converted to NA.
Gregory R. Warnes <greg@warnes.net>
RomanToInt( c('I', 'V', 'X', 'C', 'L', 'D', 'M' ) )
# works regardless of case
RomanToInt( 'MMXVI' )
RomanToInt( 'mmxvi' )
# works beyond R's limit of 3899
val.3899 <- 'MMMDCCCXCIX'
val.3900 <- 'MMMCM'
val.4000 <- 'MMMM'
as.numeric(as.roman( val.3899 ))
as.numeric(as.roman( val.3900 ))
as.numeric(as.roman( val.4000 ))
RomanToInt(val.3899)
RomanToInt(val.3900)
RomanToInt(val.4000)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.