Remove duplicated rows

Question

I have read a CSV file into an R data.frame. Some of the rows have the same element in one of the columns. I would like to remove rows that are duplicates in th

Answer 1

With sqldf:

# Example by Mehdi Nellen
a <- c(rep("A", 3), rep("B", 3), rep("C",2))
b <- c(1,1,2,4,1,1,2,2)
df <-data.frame(a,b)

Solution:

 library(sqldf)
    sqldf('SELECT DISTINCT * FROM df')

Output:

  a b
1 A 1
2 A 2
3 B 4
4 B 1
5 C 2