Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.003 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'python.': 0.02; 'everybody,': 0.07; '#include': 0.09; 'closest': 0.09; 'pointers': 0.09; 'cc:addr:python-list': 0.11; 'python': 0.11; 'cheers': 0.12; '/**': 0.16; '0.1);': 0.16; '0.5;': 0.16; 'iterators': 0.16; 'left,': 0.16; 'x1,': 0.16; 'y1,': 0.16; 'wrote:': 0.18; '<': 0.19; 'example': 0.22; 'cc:addr:python.org': 0.22; 'header:User- Agent:1': 0.23; 'compilation': 0.24; 'pointer': 0.24; 'cc:2**0': 0.24; 'cc:no real name:2**0': 0.24; 'defined': 0.27; 'header:In- Reply-To:1': 0.27; 'function': 0.29; 'knows': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'there': 0.35; 'functions.': 0.36; 'method': 0.36; 'thanks': 0.36; 'too': 0.37; 'step': 0.37; 'message-id:@gmail.com': 0.38; 'skip:& 10': 0.38; 'how': 0.40; 'new': 0.61; 'such': 0.63; 'to:addr:gmail.com': 0.65; 'here': 0.66; 'received:192.168.0.3': 0.84; 'discovering': 0.91; 'notion': 0.91 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:message-id:date:from:user-agent:mime-version:to:cc :subject:references:in-reply-to:content-type; bh=drUSdx5IKFp9+3W2L9OuwpIrfr8Z/jOmXHHBacCCkqA=; b=FvCq+j2cj4ur6oSBAAyLDWQNILNc+gjaxpNFrdLkVK4MeIS7LcFayX2S/5lNNbxEp+ ZzeFGTtuNBp96WBe+YcuG4YvuOJzUXh4KqAJvaUhR97tWCNIkAZQzgx6SIPj0sO9bSlx whVd7+Syov53ddPLhxdPE99nQzNB1v20MmgGccu42KwSHdZ9PIrMy2cU7G6/AH8ReiTX YM8YCHoTP9TDJzu6Pp3Iul/3cSUrLIYJcNyhRsv0eJYi7MyherHIsKC3JGeeEOqKO7af npBrOQwIzHcUS2tbvEnAkyqShQfFsgbXaLhppfSSPQhJsRht9KHF+9PusGA/WYbcLug1 zYxQ== X-Received: by 10.194.93.133 with SMTP id cu5mr20377088wjb.56.1366305465320; Thu, 18 Apr 2013 10:17:45 -0700 (PDT) Date: Thu, 18 Apr 2013 19:17:42 +0200 From: Karim User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130329 Thunderbird/17.0.5 MIME-Version: 1.0 To: abdelkader belahcene Subject: Re: equivalent to C pointer References: In-Reply-To: Content-Type: multipart/alternative; boundary="------------000109070308020305090805" Cc: python-list@python.org X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 179 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1366305472 news.xs4all.nl 2312 [2001:888:2000:d::a6]:59294 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:43842 This is a multi-part message in MIME format. --------------000109070308020305090805 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hello, There is no such notion in python. But the closest are iterators and generator functions. Cheers Karim On 18/04/2013 19:06, abdelkader belahcene wrote: > Hi everybody, > > I am new to python and I am discovering it. > I know C well, > and want to know if python knows how to manage Pointers > like pointer to function here is a C example how to write it in python > Intergration with trapeze method > > When we write Trapeze ( at the compilation level) we don't know > which functions > Fonc to handle. Here for example we use sin and a user defined F1 > The program is attached too > > #include > #include > > double F1 (double x){ > return x*x; > } > double Trapeze(double Fonc(double ), > double left, double right, double step){ > double X1, X0, Y0, Y1, Z = 0; > for(X0=left; X0 < right ; X0 = X0 + step) { > X1 = X0 + step; > Y1 = Fonc(X1); Y0 = Fonc(X0); > Z += (Y1 + Y0) * step * 0.5; > } > return Z; > } > int main(){ > double y; > y=Trapeze(sin, -2.5, 3.2, 0.1); > printf("\n\tValue for sin is : \t %8.3lf ", y); > y=Trapeze(F1, 0, 3, 0.1); > printf("\n\tValue for F1 is : \t %8.3lf ", y); > return 0; > } > /** > Value for sin is : 0.197 > Value for F1 is : 9.005 > */ > thanks a lot > > --------------000109070308020305090805 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit

Hello,

There is no such notion in python.
But the closest are iterators and generator functions.

Cheers
Karim

On 18/04/2013 19:06, abdelkader belahcene wrote:
Hi everybody, 

I am new to python  and I am discovering it.
I know C well,
and want to know if python knows how to manage Pointers
like pointer to function  here is a C example how to write it in python
Intergration with trapeze method

When we write Trapeze   ( at the compilation level) we don't know which functions
Fonc  to handle.      Here for example we use  sin and a user defined  F1
The program is attached too

#include <stdio.h>
#include <math.h>
 
double F1 (double x){
        return x*x;
}
double Trapeze(double Fonc(double ),
                                double left, double right, double step){
  double X1, X0, Y0, Y1, Z = 0;   
  for(X0=left; X0 < right ; X0 = X0 + step) {
    X1 = X0 + step;
    Y1 = Fonc(X1);    Y0 = Fonc(X0);
    Z  += (Y1 + Y0) * step * 0.5;
  }
   return Z;
}
int  main(){
  double y;
  y=Trapeze(sin, -2.5, 3.2, 0.1);
  printf("\n\tValue for sin  is : \t %8.3lf ", y);
  y=Trapeze(F1, 0, 3, 0.1);
  printf("\n\tValue for F1 is : \t %8.3lf ", y);
  return 0;
}
/**
    Value for sin  is :         0.197
    Value for F1 is :          9.005
    */
thanks a lot



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