[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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