Read Only Header of File in R
Last Updated :
30 Nov, 2021
In this article, we are going to see the header of the file in R Programming language.
Method 1: Using read.table method
The read.table() method in R is used to access the contents stored in the organized structure of the CSV file.
Syntax: read.table(path, head = TRUE, nrows, sep = “;”)
Arguments:
- path: The complete directory path where the file is stored
- head: a logical value, indicator of whether the file contains the names of the variables as its first line or not.
- nrows: the maximum number of rows to read into the working directory
Code:
R
data_frame1 <- data.frame (col1 = c (6:8),
col2 = letters [1:3],
col3 = c (1,4, NA ))
path <- "/Users/mallikagupta/Desktop/rcontent.csv"
write.csv2 (data_frame1,
path,
row.names = FALSE )
read.table (path,
head = TRUE ,
nrows = 1,
sep = ";" )[- 1, ]
|
Output
[1] col1 col2 col3
<0 rows> (or 0-length row.names)
Method 2: Using colnames method
The read.csv2() method in R is used to read the CSV file from the specified path argument into a tabular structure.
Syntax: read.csv2(path)
Arguments :
path: The complete directory path where the file is stored
colnames() method in base R is used to gather the column names assigned to the tabular structure of the CSV file. It takes as argument the tabular structure read from the file.
Syntax: colnames(df)
Arguments :
df: The data frame to read the header of
Code:
R
data_frame1 <- data.frame (col1 = c (6:8),
col2 = letters [1:3],
col3 = c (1,4, NA ))
path <- "/Users/mallikagupta/Desktop/rcontent.csv"
write.csv2 (data_frame1,
path,
row.names = FALSE )
colnames ( read.csv2 (path))
|
Output
[1] "col1" "col2" "col3"
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