<div dir="ltr">Sorry, typo I mean area/1 and arity 1 because you have only one parameter.</div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Jan 25, 2015 at 1:24 PM, Roelof Wobben <span dir="ltr"><<a href="mailto:r.wobben@home.nl" target="_blank">r.wobben@home.nl</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
  
    
  
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    <div>Sorry, now im totally confused .<br>
      <br>
      where does the name array come from and why a arity 1 ?<br>
      <br>
      Roelof<br>
      <br>
      <br>
      Hynek Vychodil schreef op 25-1-2015 om 13:07:<br>
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    <blockquote type="cite">
      <div dir="ltr">Hi,
        <div><br>
        </div>
        <div>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><br>
        </div>
        <div>Hynek</div>
      </div>
      <div class="gmail_extra"><br>
        <div class="gmail_quote">On Sun, Jan 25, 2015 at 12:29 PM,
          Roelof Wobben <span dir="ltr"><<a href="mailto:r.wobben@home.nl" target="_blank">r.wobben@home.nl</a>></span>
          wrote:<br>
          <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thanks,<br>
            <br>
            That error messages disappear.<br>
            <br>
            As I understand it right. The eror message is on all
            functions so on the square, circle and triangle functions.<br>
            And if not so, why also not a error functions on the other
            two.<br>
            <br>
            Roelof<br>
            <br>
            <br>
            <br>
            <br>
            Taavi Talvik schreef op 25-1-2015 om 12:22:
            <div>
              <div><br>
                <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>
                  module. And compiler sees here, that they are not used<br>
                  locally here.<br>
                  <br>
                  Try adding<br>
                  -export([area/1]).<br>
                  <br>
                  best regards,<br>
                  taavi<br>
                  On 25 Jan 2015, at 13:12, Roelof Wobben <<a href="mailto:r.wobben@home.nl" target="_blank">r.wobben@home.nl</a>>
                  wrote:<br>
                  <br>
                  <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
                    Hello,<br>
                    <br>
                    I have this programm  :<br>
                    <br>
                    -module(shapes).<br>
                    <br>
                    -import(math, [sqrt/1]).<br>
                    <br>
                    area({square, Side}) -><br>
                       Side * Side ;<br>
                    <br>
                    area({circle, Radius}) -><br>
                       math:pi() * Radius * Radius;<br>
                    <br>
                    area({triangle, A, B, C}) -><br>
                       S = (A + B + C)/2,<br>
                       math:sqrt(S*(S-A)*(S-B)*(S-C));<br>
                    <br>
                    area(Other) -><br>
                       {error, invalid_object}.<br>
                    <br>
                    <br>
                    As soon I as try to compile it , I see these
                    messages :<br>
                    <br>
                    <br>
                    6> c(shapes).<br>
                    shapes.erl:5: Warning: function area/1 is unused<br>
                    shapes.erl:15: Warning: variable 'Other' is unused<br>
                    <br>
                    Why does Erlang do this?<br>
                    On compile time you cannot see which functions are
                    used and which not in my oponion.<br>
                    <br>
                    Roelof<br>
                    <br>
                    <br>
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          </blockquote>
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    <br>
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