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2Â¥2007-06-27 15:40:31
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3Â¥2007-06-27 15:47:04
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gaojun8245

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  double   0618(double   (*f)(double   x),double   start,double   end,double   eps)   
  {   
    double   a,b,c,d;   
   
    if(eps<0.0||end-start     {   printf("end-start;   
        exit(1);   }   
    a=start;   b=end;   
    c=a+(b-a)*0.381966011;   
    d=a+(b-a)*0.618033989;   
    while(b-a>eps)   
    {   
      if((*f)(a)>(*f)(c)   &&   (*f)(c)>(*f)(d))     {   
      a=c;         c=d;         d=a+b-c;         }   
   
      else   if((*f)(b)>(*f)(d)   &&   (*f)(d)>(*f)(c))     {   
      b=d;         d=c;         c=a+b-d;         }   
   
      else   {   
      a=c;         b=d;         c=a+(b-a)*0.381966011;   
      d=a+(b-a)*0.618033989;             }   
   
    }   
    return   (a+b)/2;   
   
  }
4Â¥2007-06-27 15:55:02
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