apply_fn_via_hash_table: Apply a function via hash table

In csutil: Common Base-R Problems Relating to Lists

Apply a function via hash table

Description

This function extracts the unique input values, applies the given function to it to create a hash table (containing unique input/output combinations), and then matches the original input to the hash table to obtain the desired output.

Usage

apply_fn_via_hash_table(x, fn, ...)

Arguments

x	A vector data that needs a function applied to it.
fn	A function that will be applied to x.
...	Arguments that will be passed to 'fn'.

Details

This can dramatically speed up computation if there is a lot of data and a limited amount of unique values.

csutil documentation built on April 25, 2023, 9:12 a.m.