Create New Empty Variable in Data Frame in R (2 Examples)

In this tutorial, I’ll demonstrate how to create a new empty variable in a data frame in R.

Constructing Example Data

data(iris)                # Load iris data set
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9         3.0          1.4         0.2  setosa
# 3          4.7         3.2          1.3         0.2  setosa
# 4          4.6         3.1          1.5         0.2  setosa
# 5          5.0         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

Example 1: Creating A New Variable with NA Values

iris$empty_1 <- NA        # New NA column
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species empty_1
# 1          5.1         3.5          1.4         0.2  setosa      NA
# 2          4.9         3.0          1.4         0.2  setosa      NA
# 3          4.7         3.2          1.3         0.2  setosa      NA
# 4          4.6         3.1          1.5         0.2  setosa      NA
# 5          5.0         3.6          1.4         0.2  setosa      NA
# 6          5.4         3.9          1.7         0.4  setosa      NA

Example 2: Creating A New Variable with Empty Character strings

data$empty_2 <- ""        # New empty character column
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species empty_1 empty_2
# 1          5.1         3.5          1.4         0.2  setosa      NA
# 2          4.9         3.0          1.4         0.2  setosa      NA
# 3          4.7         3.2          1.3         0.2  setosa      NA
# 4          4.6         3.1          1.5         0.2  setosa      NA
# 5          5.0         3.6          1.4         0.2  setosa      NA
# 6          5.4         3.9          1.7         0.4  setosa      NA

Further Resources & Related Articles

Below, you may find some further resources that are related to the content of this page:

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