I wouldn’t change from operating in one function to a Task based on the code complexity, instead that should be done based on the runtime behavior, for example if a function is parallelizable then it would make sense to use concurrency like a Task (or perhaps GenStage/Flow)

You are already doing it right IMO.

The only question that’s left is: do you really want to use Elixir for math? Definitely not its forte.

Alternatively, I’d just dump the two collections of numbers in a SQLite database and do the math operation with a SELECT statement. But it depends. If the two lists of data are huge and/or not guaranteed to zip together well then Elixir might be the better tool.

The type of math mentioned in the original post seems perfectly fine for Elixir. The implementation of most functions on the math module are NIFs. The stuff that tends to be out of scope for Elixir are heavy math operations like calculating the dot product of two large matrices.

Most performant way to do math would probably be using Matrex and operating on large bulk amounts of the numbers in whatever large amounts you can get at the time (this will fit in Flow very well).