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Replace Character Value with NA in R

  • Last Updated : 29 Sep, 2021

In this article, we are going to see how to replace character value with NA in R Programming Language.

We can replace a character value with NA in a vector and in a dataframe.

Example 1: Replace Character Value with NA in vector

In a vector, we can replace it by using the indexing operation.

Syntax:

vector[vector == “character”] <- NA 

R




# create a vector with 10 characters
vector = c("a", "d", "A", "g", "S",
           "S", "t", "S", "e", "S")
 
# store actual vector in final
final = vector
 
# replace character S with NA
final[final == "S"] <- NA
 
# display final vector
print(final)

Output:

 [1] "a" "d" "A" "g" NA  NA  "t" NA  "e" NA

Example 2: Replace Character Value with NA in Dataframe

Replace character value with NA in dataframe.

Syntax:

dataframe[dataframe== “character”] <- NA

R




# create a dataframe with 10 characters
data = data.frame("a", "d", "A", "g", "S",
                  "S", "t", "S", "e", "S")
 
# store actual dataframe in final
final = data
 
# replace character A with NA
final[final == "A"] <- NA
 
# display final dataframe
print(final)

Output:

  X.a. X.d. X.A. X.g. X.S. X.S..1 X.t. X.S..2 X.e. X.S..3
1    a    d <NA>    g    S      S    t      S    e      S
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