df = data.frame(a = c(1, 3, 1, 0),
b = c(12, 98, 12, 20),
c = c(2, 4, 2, 8),
d = c(13, 77, 13, 20),
row.names = c('o', 'p', 's', 't'))
print(df)
df = unique(df)
print(df)
# run:
#
# a b c d
# o 1 12 2 13
# p 3 98 4 77
# s 1 12 2 13
# t 0 20 8 20
# a b c d
# o 1 12 2 13
# p 3 98 4 77
# t 0 20 8 20
#