<div dir="ltr"><div><div><div><div>Thanks for answer,  <br>but with C  we can compile the trapeze function and put it in librairy,  <br></div>If we try to save the trapeze alone in  package to import it later,  I think, I am not sure<br>
</div>it will be refused because F1 and sin are not define !!!     this is the power of the C pointers !!!<br></div>the link is dynamic<br><br></div>thanks<br><div><div><div><div><br></div></div></div></div></div><div class="gmail_extra">
<br><br><div class="gmail_quote">On Thu, Apr 18, 2013 at 6:17 PM, Karim <span dir="ltr"><<a href="mailto:kliateni@gmail.com" target="_blank">kliateni@gmail.com</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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      Hello,<br>
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      There is no such notion in python.<br>
      But the closest are iterators and generator functions.<br>
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      Cheers<span class="HOEnZb"><font color="#888888"><br>
      Karim</font></span><div><div class="h5"><br>
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      On 18/04/2013 19:06, abdelkader belahcene wrote:<br>
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                    <div>Hi everybody,  <br>
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                    I am new to python  and I am discovering it.<br>
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                  I know C well,<br>
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                and want to know if python knows how to manage Pointers<br>
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              like pointer to function  here is a C example how to write
              it in python<br>
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            <div>Intergration with trapeze method<br>
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            When we write Trapeze   ( at the compilation level) we don't
            know which functions <br>
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          Fonc  to handle.      Here for example we use  sin and a user
          defined  F1<br>
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        The program is attached too<br>
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                          <div>#include <stdio.h><br>
                            #include <math.h><br>
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                            double F1 (double x){ <br>
                                    return x*x; <br>
                            }<br>
                            double Trapeze(double Fonc(double ), <br>
                                                            double left,
                            double right, double step){<br>
                              double X1, X0, Y0, Y1, Z = 0;    <br>
                              for(X0=left; X0 < right ; X0 = X0 +
                            step) {<br>
                                X1 = X0 + step;<br>
                                Y1 = Fonc(X1);    Y0 = Fonc(X0);<br>
                                Z  += (Y1 + Y0) * step * 0.5;<br>
                              }<br>
                               return Z;<br>
                            }<br>
                            int  main(){ <br>
                              double y;<br>
                              y=Trapeze(sin, -2.5, 3.2, 0.1);<br>
                              printf("\n\tValue for sin  is : \t %8.3lf
                            ", y);<br>
                              y=Trapeze(F1, 0, 3, 0.1);<br>
                              printf("\n\tValue for F1 is : \t %8.3lf ",
                            y);<br>
                              return 0;<br>
                            } <br>
                            /**<br>
                                Value for sin  is :         0.197 <br>
                                Value for F1 is :          9.005<br>
                                */<br>
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                            thanks a lot<br>
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