Shorter scientific notation like "1.01e5" instead of "1.01e+05" (:erlang.float_to_binary)

I don’t think that this is possible. If you check the documentation for :erlang.float_to_list/2 you can see what the options give you. An alternative could be to use Erlang formatted output but I can’t remember how the options work.

Thank you. I will then just stick to the longer scientific notation. In case one really needs it one could just post-process the string but I think I don’t really need the shorter notation, it was just bothering me a bit.

You can do that with ex_cldr_numbers but you probably wouldn’t use it if this is the only requirement (I’m the author).

iex> Cldr.Number.to_string 1012.670, format: "0.00E+0"
{:ok, "1.01E+3"}

It works! The exponential “E” is always capital but that does not matter for me.