Data Frames in R Language are generic data objects of R which are used to store the tabular data. Data frames can also be interpreted as matrices where each column of a matrix can be of the different data types. DataFrame is made up of three principal components, the data, rows, and columns.
Extract data from a data frame means that to access its rows or columns. One can extract a specific column from a data frame using its column name.
Example:
# R program to extract
# data from the data frame
# creating a data frame
friend.data <- data.frame(
friend_id = c(1:5),
friend_name = c("Sachin", "Sourav",
"Dravid", "Sehwag",
"Dhoni"),
stringsAsFactors = FALSE
)
# Extracting friend_name column
result <- data.frame(friend.data$friend_name)
print(result)
Output:
friend.data.friend_name
1 Sachin
2 Sourav
3 Dravid
4 Sehwag
5 Dhoni