Steven Sanderson has a multi-parter for us. First up is a look at the pmap() function in R’s purrr library:
The pmap() function in R is part of the purrr library, which is a package designed to make it easier to work with functions that operate on vectors, lists, and other types of data structures.
The pmap() function is used to apply a function to a list of arguments, where each element in the list contains the arguments for a single function call. The function is applied in parallel, meaning that each call is executed concurrently, which can help speed up computations when working with large datasets.
imap()function is a powerful tool for iterating over a list or a vector while also keeping track of the index or names of the elements. This function applies a given function to each element of a list, along with the name or index of that element, and returns a new list with the results.
imap()function takes two main arguments:
xis the list or vector to iterate over, and
.fis the function to apply to each element. The .f function takes two arguments: x and i, where x is the value of the element and i is the index or name of the element.
Both of these sound a little complex and abstract at first, though as you get more familiar with them, you get to see just how powerful they are.