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

#formatting#float
odohMei7

odohMei7

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

Hi

I would like to know if/how I can format a float in shorter scientific notation than what :erlang.float_to_binary gives me. For example

iex(1)> 1012.670|>:erlang.float_to_binary(scientific: 2)
"1.01e+03"

But I want “1.01e3”. Is this possible? I tried to combine Float.round and Float.to_string but this does not necessarily give scientific notation. Thank you.

4 comments
#float
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kip

kip

ex_cldr Core Team

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"}
3
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Also Liked

rvirding

rvirding

Creator of Erlang

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.

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