reshape dataframe based on a string split in one column in R

Question

I have the following data structure

ID  Type  Values
1   A     5; 7; 8
2   A     6
3   B     2; 3

and I would like to reshape it to the fol

Answer 1

Not a beautiful answer but it could be useful

DF <- data.frame(ID=1:3,
                 Type=c('A','A','B'), 
                 Values=c(' 5; 7; 8', '6', ' 2;3')) # this is your df

    # split vectors and coercing values to be numeric
    List <- lapply(strsplit(Values, ';'), as.numeric)

# The desired output
    data.frame(ID=rep(ID, sapply(List, length)), 
               Type=rep(Type, sapply(List, length)),
               Values =   unlist(List))
 ID Type Values
1  1    A      5
2  1    A      7
3  1    A      8
4  2    A      6
5  3    B      2
6  3    B      3