In this chapter, let’s learn how to perform intersect in R for Vector and data frame. intersect() function in R performs intersection of two or more vectors and data frames.
Intersect in R- intersect of vectors:
# intersection of two vectors in R with intersect function x <- c(1:4) y <- c(2:7) intersect(x,y)
on execution of above code the output will be intersect of two vectors
intersect in R – intersection of data frames:
Intersection of two data frames in R can be easily achieved by using merge() function. Lets see with an example. First lets create two data frames
#Create two data frames
df1 = data.frame(CustomerId = c(1:6), Product = c(rep("Oven", 3), rep("Television", 3)))
df2 = data.frame(CustomerId = c(4:7), Product = c(rep("Television", 2), rep("Air conditioner", 2)))
df1 will be
CustomerId Product
1 1 Oven
2 2 Oven
3 3 Oven
4 4 Television
5 5 Television
6 6 Television
df2 will be
CustomerId Product
1 4 Television
2 5 Television
3 6 Air conditioner
4 7 Air conditioner
Then merge these two data frames as shown below
# intersection of data frames in R df_intersect<-merge(df1,df2) df_intersect
so the resultant data frame will be intersect of above two data frames
CustomerId Product
1 4 Television
2 5 Television
Thus we have performed intersect in R for two data frames.
