This is a **plain text list **. In future please post in plain text so that
your post does not get mangled.
Anyway,...
I don't know about "efficient, optimized", but here's one simple way to do
it using ?strsplit to unsplit and then ?paste to recombine:
df <- data.frame(ID=1:3, FOO=c('A_B','A_B_
Assuming, I have a data frame like this ..
df <- data.frame(ID=1:3, FOO=c('A_B','A_B_C','A_B_C_D_E'))
I want to do a 'cumulative split' of the values in column FOO based on the
delimiter '_'. The end result should be like this ..
ID FOO FOO_SPLIT1 FOO_SPLIT2 FOO_SPLIT
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