Apply User-Defined Function to Each Data Frame Element in R (Example Code)

This page explains how to apply a user-defined function to each data frame cell in the R programming language.

Creation of Exemplifying Data

data(iris)                                               # Loading iris data set
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: Applying Manually Defined Function to Each Data Frame Cell

iris[] <- lapply(iris, function(x) { paste("new", x) })  # Using lapply() function
head(iris)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width    Species
# 1      new 5.1     new 3.5      new 1.4     new 0.2 new setosa
# 2      new 4.9       new 3      new 1.4     new 0.2 new setosa
# 3      new 4.7     new 3.2      new 1.3     new 0.2 new setosa
# 4      new 4.6     new 3.1      new 1.5     new 0.2 new setosa
# 5        new 5     new 3.6      new 1.4     new 0.2 new setosa
# 6      new 5.4     new 3.9      new 1.7     new 0.4 new setosa

Further Resources & Related Tutorials

Please find some related R tutorials in the following list.

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