ex5 task5

ex5/code/task_2-5/task_2.cpp

@@ -0,0 +1,93 @@
+#include "task_2.h"
+#include <cassert>          // assert
+#include <cmath>
+#include <fstream>
+#include <omp.h>
+
+tuple<double, double> min_max_par(const vector<double> &v) {
+    int min_val = v[0];
+    int max_val = v[0];
+
+    #pragma omp parallel for reduction(min:min_val) reduction(max:max_val)
+    for (size_t i = 0; i < v.size(); ++i) {
+        if (v[i] < min_val) min_val = v[i];
+        if (v[i] > max_val) max_val = v[i];
+    }
+
+    return make_tuple(min_val,max_val);
+}
+
+
+tuple<double, double, double> means_par(const vector<double>& v){
+    size_t n = v.size();
+    double sum = 0;
+    double logsum = 0;
+    double invsum = 0;
+
+    #pragma omp parallel for shared(v,n) reduction(+:sum, logsum, invsum)
+    for (size_t i = 0; i<n; ++i){
+        sum += v[i];
+        logsum += log(v[i]);
+        invsum += 1.0/v[i];
+    }
+
+    double arith = sum / static_cast<double>(n);
+    double geo = exp(1.0/static_cast<double>(n) * logsum);
+    double harm = static_cast<double>(n) / invsum;
+    return make_tuple(arith, geo, harm);
+}
+
+void fill_vector(istream& istr, vector<double>& v)
+{
+    double d=0;
+    while ( istr >> d) v.push_back(d); // Einlesen
+    if (!istr.eof())
+    { // Fehlerbehandlung
+        cout << " Error handling \n";
+        if ( istr.bad() )  throw runtime_error("Schwerer Fehler in istr");
+        if ( istr.fail() )   // Versuch des Aufraeumens
+        {
+            cout << " Failed in reading all data.\n";
+            istr.clear();
+        }
+    }
+    v.shrink_to_fit();                 // C++11
+    return;
+}
+
+
+void read_vector_from_file(const string& file_name, vector<double>& v)
+{
+    ifstream fin(file_name);           // Oeffne das File im ASCII-Modus
+    if( fin.is_open() )                // File gefunden:
+    {
+       v.clear();                      // Vektor leeren
+       fill_vector(fin, v);
+    }
+    else                               // File nicht gefunden:
+    {
+        cout << "\nFile " << file_name << " has not been found.\n\n" ;
+        assert( fin.is_open() && "File not found." );       // exeption handling for the poor programmer
+    }
+
+ return;
+}
+
+void write_vector_to_file(const string& file_name, const vector<double>& v)
+{
+    ofstream fout(file_name);          // Oeffne das File im ASCII-Modus
+    if( fout.is_open() )
+    {
+       for (size_t k=0; k<v.size(); ++k)
+       {
+          fout << v.at(k) << endl;
+       }
+    }
+    else
+    {
+        cout << "\nFile " << file_name << " has not been opened.\n\n" ;
+        assert( fout.is_open() && "File not opened."  );         // exeption handling for the poor programmer
+    }
+
+ return;
+}