R Passing Several Parameters to apply Functions (Example Code)

On this page you’ll learn how to pass several parameters to the family of apply functions in the R programming language.

Creation of Example Data

data(iris)                      # Loading iris data
iris_new <- iris[ , 1:4]        # Modify iris data
iris_new$Sepal.Length[1] <- NA
head(iris_new)                  # Head of modified iris data
#   Sepal.Length Sepal.Width Petal.Length Petal.Width
# 1           NA         3.5          1.4         0.2
# 2          4.9         3.0          1.4         0.2
# 3          4.7         3.2          1.3         0.2
# 4          4.6         3.1          1.5         0.2
# 5          5.0         3.6          1.4         0.2
# 6          5.4         3.9          1.7         0.4

Example: Specifying Multiple Arguments in apply() Function

apply(iris_new,                 # No additional arguments
      2,
      sum)
# Sepal.Length  Sepal.Width Petal.Length  Petal.Width 
#           NA        458.6        563.7        179.9
apply(iris_new,                 # Multiple arguments
      2,
      sum,
      na.rm = TRUE)
# Sepal.Length  Sepal.Width Petal.Length  Petal.Width 
#        871.4        458.6        563.7        179.9

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