Consolidate Duplicate Rows in Data Frame in R (Example Code)

In this tutorial, I’ll illustrate how to consolidate duplicate rows in a data frame in the R programming language.

Creation of Example Data

data(iris)                           # Loading some 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: Sum Duplicates in Data Using aggregate() Function

aggregate(. ~ Species, iris, sum)    # Consolidate duplicate rows
#      Species Sepal.Length Sepal.Width Petal.Length Petal.Width
# 1     setosa        250.3       171.4         73.1        12.3
# 2 versicolor        296.8       138.5        213.0        66.3
# 3  virginica        329.4       148.7        277.6       101.3

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