# [erlang-questions] strange result of lists:map(fun(X)-> 20*X end, [2, 4, 6, 8]).

hope <>
Wed Dec 4 16:31:50 CET 2013

```Hi, Work :

Again, thank you so much !

Ha, Ha ! Great !  It really work !

best regards.

2013.12.0

---------------------------------------------------------------------------------

From: Work
Sent: Wednesday, December 04, 2013 1:46 AM
To: Patrick Schless
Cc:  ; erlang-questions
Subject: Re: [erlang-questions] strange result of lists:map(fun(X)-> 20*X end, [2, 4, 6, 8]).

Yeah, this should work:

io:format("~w~n", [lists:map(fun(X)-> 20*X end,L)]).

On Dec 3, 2013, at 14:41, Patrick Schless <> wrote:

In cases like this, is there a way to explicitly show the result as numbers (as Hope expected)?

On Tue, Dec 3, 2013 at 9:24 AM, Work <> wrote:

Hi!

Since strings in Erlang are just lists of integers, and the results of some of your tests are proper lists of strings, they’re *displayed* as strings.
In other words "(Px?" = [40, 80, 120, 160]
Hope that helps :)
For reference, check this: http://learnyousomeerlang.com/starting-out-for-real#lists

On Dec 3, 2013, at 12:13, <> <> wrote:

Hi,

I am a beginner,  and I got some strange result like this :

1> L=[2,4,6,8].
[2,4,6,8]
2> lists:map(fun(X)-> 20*X end,L).
"(Px?"
3> lists:map(fun(X)-> 21*X end,L).
"*T~‥"
4> lists:map(fun(X)-> 27*X end,L).
"6l¢O"
5> lists:map(fun(X)-> 28*X end,L).
"8p‥a"
6> lists:map(fun(X)-> 29*X end,L).
":tRe"
7> lists:map(fun(X)-> 30*X end,L).
"<x’e"
8> lists:map(fun(X)-> 31*X end,L).
">|oo"
9> lists:map(fun(X)-> 32*X end,L).
[64,128,192,256]
10> lists:map(fun(X)-> 22*X end,L).
[44,88,132,176]
11> lists:map(fun(X)-> 23*X end,L).
[46,92,138,184]
12> lists:map(fun(X)-> 24*X end,L).
[48,96,144,192]
13> lists:map(fun(X)-> 25*X end,L).
[50,100,150,200]
14> lists:map(fun(X)-> 26*X end,L).
[52,104,156,208]
15> lists:map(fun(X)-> 27*X end,L).
"6l¢O"

-------------------
Erlang R16B02 (erts-5.10.3) [smp:2:2] [async-threads:10]
Eshell V5.10.3 (abort with ^G)
-------------------
Windows Vista
-------------------

Can someone help me ?

Thanks a lot !

best regards.

2013.12.03

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