R Adding Column Names / Header to Data Frame (Example Code)

This article explains how to read a data set without header and adjust the column names in the R programming language.

Creation of Example Data

data(iris)                                    # Example data in R
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
write.table(iris,                             # Writing data without header
            "iris.csv",
            sep = ";",
            row.names = FALSE,
            col.names = FALSE)

Example: Read Data without Header & Rename Column Names

iris_import <- read.csv2("iris.csv",          # Read data set without column names
                         header = FALSE)
head(iris_import)                             # Print data frame to RStudio console
#    V1  V2  V3  V4     V5
# 1 5.1 3.5 1.4 0.2 setosa
# 2 4.9   3 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 3.6 1.4 0.2 setosa
# 6 5.4 3.9 1.7 0.4 setosa
colnames(iris_import) <- c("Sepal.Length",    # Renaming variables
                           "Sepal.Width",
                           "Petal.Length",
                           "Petal.Width",
                           "Species")
head(iris_import)                             # Print data frame to RStudio console
#   Sepal.Length Sepal.Width Petal.Length Petal.Width Species
# 1          5.1         3.5          1.4         0.2  setosa
# 2          4.9           3          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         3.6          1.4         0.2  setosa
# 6          5.4         3.9          1.7         0.4  setosa

Related Articles

Have a look at the following R programming tutorials. They discuss topics such as variables and loops.

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