[erlang-questions] Newbie Question about io:format

Hakim Fajardo keam7095@REDACTED
Tue Feb 21 10:15:56 CET 2017

First, thank you because this is a great resource.

Second, I started writing basic programs every day to improve my Erlang
coding. I wrote a simple program that calculates the average of a list of
numbers. But I keep getting this error about io:format.

prices([]) ->
    io:format("List is empty ~n");

%% determine number of items in the list to calculate average%%

prices(L) when is_list(L) ->
  Size = length(L),
  Sum1 = lists:sum(L),
  Av1 = Sum1 / Size,
  io:format("The average equals ~n", Av1).


Eshell V8.2  (abort with ^G)
1> L = [1,2,2,2,3,3,4].

2> c(standev).

3> standev:prices(L).
** exception error: bad argument
     in function  io:format/3
        called as io:format(<0.50.0>,"The average equals

Why am I getting '**exception error:'?

Thank you, I hope this isn't too newbie a question.
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