The “map” Function in R

• Package: purrr

• Purpose: Apply a function to each element of a list or vector and return a list of the results.

• General class: Function

• Required argument(s):

• .x: A list or vector to which the function is applied.

• .f: A function to apply to each element of .x.

• Notable optional arguments:

• .progress: A logical or function to show progress, useful for long computations.

• Example:

• # Load the required library
  library(purrr)
  
  # Define a list of numeric vectors
  list_of_vectors <- list(c(1, 2, 3), c(4, 5, 6), c(7, 8, 9))
  
  # Apply the function to each vector in the list
  results <- map(list_of_vectors, sum)
  
  # Print the results
  print(results)

• In this example, the map function from the purrr package is used to apply the function “sum” to each element in list_of_vectors. The “sum” function calculates the sum of the elements in each vector. The result is a list of sums corresponding to each vector.