R Using apply() Function Only for Certain Columns of a Data Frame (Example Code)

This tutorial explains how to use the apply function only for some selected columns in the R programming language.

Creation of Example Data

data(iris)                                              # 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: Using apply() Function for Specific Variables of Data Frame

iris_new <- data.frame(apply(iris[ , 1:2], 2, cumsum),  # Apply cumsum function to certain columns
                       iris[ , 3:ncol(iris)])
head(iris_new)
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2         10.0         6.5          1.4         0.2  setosa
# 3         14.7         9.7          1.3         0.2  setosa
# 4         19.3        12.8          1.5         0.2  setosa
# 5         24.3        16.4          1.4         0.2  setosa
# 6         29.7        20.3          1.7         0.4  setosa

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