R How to Reset Index Numbers of Rows in Data Frame (Example Code)

This tutorial shows how to modify or reset all index numbers of a data frame in R programming.

data(iris)                        # Example data
iris_new <- iris[c(77, 1, 55, 20, 6, 10), ]
iris_new                          # Display example data in RStudio
#    Sepal.Length Sepal.Width Petal.Length Petal.Width    Species
# 77          6.8         2.8          4.8         1.4 versicolor
# 1           5.1         3.5          1.4         0.2     setosa
# 55          6.5         2.8          4.6         1.5 versicolor
# 20          5.1         3.8          1.5         0.3     setosa
# 6           5.4         3.9          1.7         0.4     setosa
# 10          4.9         3.1          1.5         0.1     setosa

Example: Resetting Index Numbers of Data Frame Rows to Sequence from 1 to N

rownames(iris_new) <- NULL        # Resetting index numbers of rows
iris_new                          # Display updated index numbers and data
#   Sepal.Length Sepal.Width Petal.Length Petal.Width    Species
# 1          6.8         2.8          4.8         1.4 versicolor
# 2          5.1         3.5          1.4         0.2     setosa
# 3          6.5         2.8          4.6         1.5 versicolor
# 4          5.1         3.8          1.5         0.3     setosa
# 5          5.4         3.9          1.7         0.4     setosa
# 6          4.9         3.1          1.5         0.1     setosa

Related Articles

In the following, you may find some further resources on topics such as vectors, factors, and dates:

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