Number of Rows & Columns of Data Frame in R (3 Examples)

In this article you’ll learn how to determine the number of rows and columns of a data frame in R programming.

Creation of Example Data

data(iris)                       # Loading example data frame
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 1: Apply the ncol() & length() Functions to Get the Number of Columns of a Data Frame

ncol(iris)                       # Applying ncol function
# [1] 5
length(iris)                     # Applying length function
# [1] 5

Example 2: Apply the nrow() Function to Get the Number of Rows of a Data Frame

nrow(iris)                       # Applying nrow function
# [1] 150

Example 3: Apply the dim() Function to Get the Dimensions of a Data Frame

dim(iris)                        # Applying dim function
# [1] 150   5

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