Using apply() Function by Row & Column in R (2 Examples)

In this R programming post you’ll learn how to use the apply command.

Creating Example Data

data(iris)                      # Loading iris 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 1: Using apply() Function by Row

apply(iris[ , 1:4], 1, mean)    # apply function by row
# 2.550 2.375 2.350 2.350 2.550 2.850 2.425 2.525 2.225 2.400 2.700 2.500 2.325 2.125 ...

Example 2: Using apply() Function by Column

apply(iris, 2, is.numeric)      # apply function by column
# Sepal.Length  Sepal.Width Petal.Length  Petal.Width      Species 
#        FALSE        FALSE        FALSE        FALSE        FALSE

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