ifelse without else in R Programming (Example Code)

This post illustrates how to drop the else output when using the ifelse command in the R programming language.

Construction of Example Data

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

Example: Avoid else-Output within ifelse() Function

iris$new <- ifelse(test = iris$Sepal.Length <= 5,  # Only change if condition is TRUE
                   yes = "low",
                   no = iris$Sepal.Length)
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species new
# 1          5.1         3.5          1.4         0.2  setosa 5.1
# 2          4.9         3.0          1.4         0.2  setosa low
# 3          4.7         3.2          1.3         0.2  setosa low
# 4          4.6         3.1          1.5         0.2  setosa low
# 5          5.0         3.6          1.4         0.2  setosa low
# 6          5.4         3.9          1.7         0.4  setosa 5.4

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