To find whether a column exists in data frame or not?

Question

I have a data.frame with the name "abcframe" a b c 1 1 1 2 2 3How might I find whether a column exists or not in a given data frame?For example, I would like to find whether a **column d** exists in the data.frame **abcframe**.

Answer 1

#I will create the example dataframe and show code to help find if a column called "d" exists in it.

a=c(1,2)

b=c(1,2)

c=c(1,3)

example=data.frame(a,b,c)

#If you want to find whether there exists a column called "d":

"d" %in% names(example)

names() gives back the column names of a dataframe

a %in% b returns TRUE when a is an element in b. For example,

1 %in% c(1,2,3,4) returns TRUE.