Get Index Positions of Multiple Minima & Maxima in Data Frame Column in R (2 Examples)

In this R tutorial you’ll learn how to identify the positions of multiple minima and maxima.

Creation 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: Find Index of First Minimum or Maximum

which.min(iris$Petal.Width)                       # Applying which.min function
# [1] 10
which.max(iris$Petal.Width)                       # Applying which.max function
# [1] 101

Example 2: Find Indices of Every Minima or Maxima

which(iris$Petal.Width == min(iris$Petal.Width))  # Applying which & min
# [1] 10 13 14 33 38
which(iris$Petal.Width == max(iris$Petal.Width))  # Applying which & max
# [1] 101 110 145

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