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_SPLIT3
FOO_SPLIT4 FOO_SPLIT5
1 A_B A A_B
2 A_B_C A A_B
A_B_C
3 A_B_C_D_E A A_B A_B_C
A_B_C_D A_B_C_D_E
Any efficient, optimized way to do this?
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