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