[R] how to sort a column with numbers and characters

Hi, I would like to sort a data frame by a column, the column to sort by has a list of numbers 1:150 (a few numbers are missing so the total is 137) and two letters S , Z. How can I sort it so that first I have the numbers in running order (1,2,3,...150) and then the letters S and Z? the column

Re: [R] how to sort a column with numbers and characters

Change that column to be a factor with the levels in the order that you wish. dataFrame$column - factor(dataFrame$column, levels=c(1:150, S, Z)) Then it will sort in that order. E.g., d - data.frame(One=c(5,21,10,Z,S,9), Two=2^(1:6)) d[order(d$One),] One Two 3 10 8 2 21 4