cpp_snip/vector_double.cpp at master · tcm/cpp_snip · GitHub

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#include <vector>
#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
#include <ctime>
#include <algorithm>
#include <cmath>

using namespace std;

double arith_avg( vector<double>& lst );
double median(vector<double>& lst);
double graph_avg(vector<double>& lst);

double arith_avg_file( ifstream& fin );
void read_csv_file( ifstream& csv_data, vector<double>& lst );

bool myfunction (double i, double j) { return (i<j); }


main()
{
   vector<double> SS;
   double ergebnis;

   clock_t start = clock();

   /* Berechnen und ausgeben. */
   /* ifstream myfile1 ("plop.csv");
   ergebnis = arith_avg_file(myfile1);
   cout << "File : " << ergebnis << endl;  */


   /* Berechnen und ausgeben. */
   ifstream myfile2 ("plop.csv");

   if (myfile2.is_open())
   {
     // Lesen.
     read_csv_file(myfile2, SS);

     // Sortieren.
     sort (SS.begin(), SS.end(), myfunction);

     // Mittelwerte berechnen.
     // ergebnis = arith_avg(SS);
     // ergebnis = median(SS);
     ergebnis = graph_avg(SS);


     cout << "Vector: " << ergebnis << endl;
   }
   else cout << "Unable to open file" << endl;


   clock_t ends = clock();
   cout << "Time elapsed " << (double) (ends - start) / CLOCKS_PER_SEC << endl;

}

/* --------------------------------------------- */
/* Arithmetischen Mittelwert berechnen (Vector).  */
/* ----------------------------------------------*/
double arith_avg(vector<double>& lst) {

   double avg = 0;
   double summe = 0;


   // Über das Array iterieren.
   // cout << "Loop by index:" << endl;
   int ii;
   for(ii=0; ii < lst.size(); ii++)
   {
      //cout << lst[ii] << endl;
      summe += lst[ii];
   }

   avg = ( summe / lst.size() );

   return avg;
}

/* --------------------------------------------- */
/* Median berechnen (Vektor).                    */
/* ----------------------------------------------*/
double median(vector<double>& lst) {
   long anzahl = 0;
   long index = 0;
   double lwert;
   double rwert;
   double wert;

   anzahl = lst.size();

   if ( anzahl % 2 ) {  // Falls: eine ungerade Anzahl an Elementen.

      // Index des Elementes in der Mitte bestimmen.
      index = ((anzahl + 1 ) / 2) - 1;
      return lst[index];
   }
   else {               // Falls: eine gerade Anzahl an Elementen.

       lwert = lst[(anzahl/2)-1]; // Linker Mittelwert.
       rwert = lst[(anzahl/2)];   // Rechter Mittelwert.

       wert = 0.5 * ( lwert + rwert ); // Die Hälfte davon.
       return wert;
   }


}

/* --------------------------------------------- */
/* Graphisches Mittel (Vektor).                  */
/* ----------------------------------------------*/
double graph_avg(vector<double>& lst) {
   double produkt = 1;
   double anzahl = 0;

   anzahl = lst.size();

    // Über das Array iterieren.
   int ii;
   for(ii=0; ii < lst.size(); ii++)
   {
      cout << lst[ii] << endl;
      produkt *= lst[ii];
   }

    //cout << produkt << "   ";
    //cout << anzahl << endl;
   return pow(produkt, (1/anzahl));
}


/* --------------------------------------------- */
/* Arithmetischen Mittelwert berechnen.          */
/* Werte nicht zwischenspeichern.                */
/* --------------------------------------------- */
double arith_avg_file( ifstream& csv_data ) {

  double summe = 0;
  double avg = 0;
  double anzahl = 0;
  string line;

  while(getline(csv_data,line))
  {
     stringstream  lineStream(line);
     string        cell;
     while(getline(lineStream, cell,','))
     {
        // You have a cell!!!!
        //cout << cell << endl;
        summe  = summe + atof(cell.c_str());
        anzahl++;
     }
  }

  avg = summe / anzahl;

  return avg;
}

/* --------------------------------------------- */
/* Read CSV-File into Vector.                    */
/* --------------------------------------------- */
void read_csv_file( ifstream& csv_data, vector<double>& lst ) {

  string line;

  while(getline(csv_data,line))
  {
     stringstream  lineStream(line);
     string        cell;
     while(getline(lineStream, cell,','))
     {
        // You have a cell!!!!
        //cout << cell << endl;
        lst.push_back( atof(cell.c_str()) );

     }
  }
}