R Get Row Numbers where Data Frame Variable has Specific Value (Example Code)

In this R tutorial you’ll learn how to return the row indices of rows with a specific column value.

Example Data

data(iris)                         # Iris flower 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: Return Row Indices of Data Frame where Variable has Specific Value

which(iris$Sepal.Length == 5.1)    # Get row indices
# 1 18 20 22 24 40 45 47 99

Related Articles

Below, you can find some further resources on topics such as data inspection, character strings, and naming data.

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