How to Apply which.max() & which.min() in R (2 Examples)

In this tutorial you’ll learn how to locate the first maximum or minimum in a data object using the which.max and which.min functions in R programming.

Construction of Example Data

data(iris)                         # Example data
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: Apply which.min() Function to Locate First Minimum

which.min(iris$Petal.Width)        # Apply which.min function
# [1] 10

Example 2: Apply which.max() Function to Locate First Maximum

which.max(iris$Petal.Width)        # Apply which.max function
# [1] 101

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