R How to Create an Index ID Column in a Data Frame (Example Code)

This page illustrates how to append an index ID to a data frame in R.

Creation of Example Data

data(iris)                                    # Load example data
head(iris)                                    # Head of example data
#   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: Creating ID Column in Data Frame

iris_new <- cbind(ID = 1:nrow(iris), iris)    # Append index ID
head(iris_new)                                # Show head of new iris data
#   ID Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1  1          5.1         3.5          1.4         0.2  setosa
# 2  2          4.9         3.0          1.4         0.2  setosa
# 3  3          4.7         3.2          1.3         0.2  setosa
# 4  4          4.6         3.1          1.5         0.2  setosa
# 5  5          5.0         3.6          1.4         0.2  setosa
# 6  6          5.4         3.9          1.7         0.4  setosa

Related Articles

Please have a look at the following R programming tutorials. They discuss topics such as loops, extracting data, variables, and indices.

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