R: Convert delimited string into variables

Question

I have a data frame with a column containing a space-delimited list of character codes:

\"Ab B C\"
\"\"
\"X C\"
\"N Ab F S\"
:

I want to co

Answer 1

In base R, another approach:

lst  = strsplit(df$Col1, ' ')
cols = unique(unlist(lst))

m = do.call(rbind, lapply(lst, function(u) cols %in% u +0))
colnames(m) = cols

#> m
#     Ab B C X N F S
#[1,]  1 1 1 0 0 0 0
#[2,]  0 0 0 0 0 0 0
#[3,]  0 0 1 1 0 0 0
#[4,]  1 0 0 0 1 1 1