Convert column with pipe delimited data into dummy variables [duplicate]

by

Another way is using cSplit_e from splitstackshape package.

splitting the dataframe by column a and fill it by 0 and drop the original column. 

library(splitstackshape)
cSplit_e(df, "a", "|", type = "character", fill = 0, drop = T)

#   a_Ben a_Chris a_Greg a_Jim a_Steve
#1     1       1      0     1       0
#2     1       0      1     1       0
#3     1       0      0     1       1

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