<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Technically Erlang does have arrays—see “erl -man array” for details.</div><div class=""><br class=""></div><div class="">-Rick</div><br class=""><div><blockquote type="cite" class=""><div class="">On Jan 25, 2015, at 4:42 PM, Christopher Vance <<a href="mailto:cjsvance@gmail.com" class="">cjsvance@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">The argument is a tuple. Erlang does not have arrays; you have to decide whether to use a list or a tuple.</div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Mon, Jan 26, 2015 at 12:36 AM, Roelof Wobben <span dir="ltr" class=""><<a href="mailto:r.wobben@home.nl" target="_blank" class="">r.wobben@home.nl</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
  <div bgcolor="#FFFFFF" text="#000000" class="">
    <div class="">Nope, Thanks for the patience with me.<br class="">
      <br class="">
      So area is the function with 1 argument a array with the shape and
      the parameters to calculate it.<br class="">
      <br class="">
      Roelof<br class="">
      <br class="">
      <br class="">
      <br class="">
      Hynek Vychodil schreef op 25-1-2015 om 14:23:<br class="">
    </div><div class=""><div class="h5">
    <blockquote type="cite" class="">
      <div dir="ltr" class="">Sorry, typo I mean area/1 and arity 1 because you
        have only one parameter.</div>
      <div class="gmail_extra"><br class="">
        <div class="gmail_quote">On Sun, Jan 25, 2015 at 1:24 PM, Roelof
          Wobben <span dir="ltr" class=""><<a href="mailto:r.wobben@home.nl" target="_blank" class="">r.wobben@home.nl</a>></span>
          wrote:<br class="">
          <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
            <div bgcolor="#FFFFFF" text="#000000" class="">
              <div class="">Sorry, now im totally confused .<br class="">
                <br class="">
                where does the name array come from and why a arity 1 ?<br class="">
                <br class="">
                Roelof<br class="">
                <br class="">
                <br class="">
                Hynek Vychodil schreef op 25-1-2015 om 13:07:<br class="">
              </div>
              <div class="">
                <div class="">
                  <blockquote type="cite" class="">
                    <div dir="ltr" class="">Hi,
                      <div class=""><br class="">
                      </div>
                      <div class="">You don't have any functions named square,
                        circle or triangle. You have only one function
                        array/1 with four function clauses, the first
                        for square, the second for circle, the third for
                        triangle and the fourth catch-all one.</div>
                      <div class=""><br class="">
                      </div>
                      <div class="">Hynek</div>
                    </div>
                    <div class="gmail_extra"><br class="">
                      <div class="gmail_quote">On Sun, Jan 25, 2015 at
                        12:29 PM, Roelof Wobben <span dir="ltr" class=""><<a href="mailto:r.wobben@home.nl" target="_blank" class="">r.wobben@home.nl</a>></span>
                        wrote:<br class="">
                        <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thanks,<br class="">
                          <br class="">
                          That error messages disappear.<br class="">
                          <br class="">
                          As I understand it right. The eror message is
                          on all functions so on the square, circle and
                          triangle functions.<br class="">
                          And if not so, why also not a error functions
                          on the other two.<br class="">
                          <br class="">
                          Roelof<br class="">
                          <br class="">
                          <br class="">
                          <br class="">
                          <br class="">
                          Taavi Talvik schreef op 25-1-2015 om 12:22:
                          <div class="">
                            <div class=""><br class="">
                              <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Until you
                                export your functions, they remain local
                                to<br class="">
                                module. And compiler sees here, that
                                they are not used<br class="">
                                locally here.<br class="">
                                <br class="">
                                Try adding<br class="">
                                -export([area/1]).<br class="">
                                <br class="">
                                best regards,<br class="">
                                taavi<br class="">
                                On 25 Jan 2015, at 13:12, Roelof Wobben
                                <<a href="mailto:r.wobben@home.nl" target="_blank" class="">r.wobben@home.nl</a>>

                                wrote:<br class="">
                                <br class="">
                                <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hello,<br class="">
                                  <br class="">
                                  I have this programm  :<br class="">
                                  <br class="">
                                  -module(shapes).<br class="">
                                  <br class="">
                                  -import(math, [sqrt/1]).<br class="">
                                  <br class="">
                                  area({square, Side}) -><br class="">
                                     Side * Side ;<br class="">
                                  <br class="">
                                  area({circle, Radius}) -><br class="">
                                     math:pi() * Radius * Radius;<br class="">
                                  <br class="">
                                  area({triangle, A, B, C}) -><br class="">
                                     S = (A + B + C)/2,<br class="">
                                     math:sqrt(S*(S-A)*(S-B)*(S-C));<br class="">
                                  <br class="">
                                  area(Other) -><br class="">
                                     {error, invalid_object}.<br class="">
                                  <br class="">
                                  <br class="">
                                  As soon I as try to compile it , I see
                                  these messages :<br class="">
                                  <br class="">
                                  <br class="">
                                  6> c(shapes).<br class="">
                                  shapes.erl:5: Warning: function area/1
                                  is unused<br class="">
                                  shapes.erl:15: Warning: variable
                                  'Other' is unused<br class="">
                                  <br class="">
                                  Why does Erlang do this?<br class="">
                                  On compile time you cannot see which
                                  functions are used and which not in my
                                  oponion.<br class="">
                                  <br class="">
                                  Roelof<br class="">
                                  <br class="">
                                  <br class="">
_______________________________________________<br class="">
                                  erlang-questions mailing list<br class="">
                                  <a href="mailto:erlang-questions@erlang.org" target="_blank" class="">erlang-questions@erlang.org</a><br class="">
                                  <a href="http://erlang.org/mailman/listinfo/erlang-questions" target="_blank" class="">http://erlang.org/mailman/listinfo/erlang-questions</a><br class="">
                                </blockquote>
                                <br class="">
                              </blockquote>
                              <br class="">
_______________________________________________<br class="">
                              erlang-questions mailing list<br class="">
                              <a href="mailto:erlang-questions@erlang.org" target="_blank" class="">erlang-questions@erlang.org</a><br class="">
                              <a href="http://erlang.org/mailman/listinfo/erlang-questions" target="_blank" class="">http://erlang.org/mailman/listinfo/erlang-questions</a><br class="">
                            </div>
                          </div>
                        </blockquote>
                      </div>
                      <br class="">
                    </div>
                  </blockquote>
                  <br class="">
                </div>
              </div>
            </div>
            <br class="">
            _______________________________________________<br class="">
            erlang-questions mailing list<br class="">
            <a href="mailto:erlang-questions@erlang.org" target="_blank" class="">erlang-questions@erlang.org</a><br class="">
            <a href="http://erlang.org/mailman/listinfo/erlang-questions" target="_blank" class="">http://erlang.org/mailman/listinfo/erlang-questions</a><br class="">
            <br class="">
          </blockquote>
        </div>
        <br class="">
      </div>
    </blockquote>
    <br class="">
  </div></div></div>

<br class="">_______________________________________________<br class="">
erlang-questions mailing list<br class="">
<a href="mailto:erlang-questions@erlang.org" class="">erlang-questions@erlang.org</a><br class="">
<a href="http://erlang.org/mailman/listinfo/erlang-questions" target="_blank" class="">http://erlang.org/mailman/listinfo/erlang-questions</a><br class="">
<br class=""></blockquote></div><br class=""><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div class="gmail_signature">Christopher Vance</div>
</div>
_______________________________________________<br class="">erlang-questions mailing list<br class=""><a href="mailto:erlang-questions@erlang.org" class="">erlang-questions@erlang.org</a><br class="">http://erlang.org/mailman/listinfo/erlang-questions<br class=""></div></blockquote></div><br class=""></body></html>