Recursion and anonymous functions in elixir

Question

I\'m trying to define an anonymous function to do a dot product, I can code this as a private function without any problem but I am struggling with the anonymous function syntax

Answer 1

You could define a module-function called fix, and use it later to define dot (and any other recursing anonymous function):

defmodule A do
    def fix(f, x) do
      f.(fn(x) -> fix(f, x) end, x)
    end

    def fix2(f, x, y) do
      f.(fn(x, y) -> fix2(f, x, y) end, x, y)
    end
end

dot = fn(x, y) ->
    A.fix2(fn
          dot, [i|input],[w|weights], acc -> dot.(input,weights,i*w+acc)
          dot, [],[bias],acc -> acc + bias
    end, x, y)
end