The “str_subset” Function in R

• Package: stringr

• Purpose: To subset a character vector based on the presence of a pattern.

• General Class: String Manipulation

• Required Argument(s):

• string: A character vector to be subsetted.

• pattern: The pattern to match for subsetting.

• Notable Optional Arguments:

• ...: Additional arguments influencing the subsetting process, such as ignore_case to perform case-insensitive matching.

• Example:

• # Example usage
  library(stringr)
  
  words <- c("apple", "banana", "orange", "grape")
  
  # Subset words that contain the letter "a"
  words_with_a <- str_subset(words, pattern = "a")
  
  print(words_with_a)

• In this example, the str_subset function from the stringr package is used to subset the character vector words based on the condition that each element contains the letter “a”. The result is a character vector containing only the elements that match the pattern.