R Create New Data Frame Column Using Other Variables (Example Code)

In this R programming tutorial you’ll learn how to add a new data frame variable according to the values of other columns.

Creation of Example Data

data(iris)                     # Iris as example 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: Adding New Variable to Data Frame Using ifelse() Function

iris$new <- ifelse(iris$Sepal.Length > 5 &
                     iris$Sepal.Width > 3.8,
                   "yes", "no")
head(iris)                     # Print updated data
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species new
# 1          5.1         3.5          1.4         0.2  setosa  no
# 2          4.9         3.0          1.4         0.2  setosa  no
# 3          4.7         3.2          1.3         0.2  setosa  no
# 4          4.6         3.1          1.5         0.2  setosa  no
# 5          5.0         3.6          1.4         0.2  setosa  no
# 6          5.4         3.9          1.7         0.4  setosa yes

Further Resources & Related Articles

Have a look at the following R programming tutorials. They illustrate topics such as loops, variables, and lists:

Leave a Reply

Your email address will not be published.

Fill out this field
Fill out this field
Please enter a valid email address.
You need to agree with the terms to proceed

Menu
Top