определение make_gistogram

histogram.cpp

@@ -0,0 +1,65 @@
+#include "histogram.h"
+#include <iostream>
+#include <vector>
+using namespace std;
+
+//std::vector<size_t>
+bool find_minmax(const vector<double>& numbers, double& minN, double& maxN)
+{
+    if (numbers.empty()) {
+        minN = maxN = 0;
+        return false;
+    }
+    minN = numbers[0];
+    maxN = numbers[0];
+
+    for (double x: numbers)
+    {
+        if (minN > x)
+        {
+            minN = x;
+        }
+        if (maxN < x)
+        {
+            maxN = x;
+        }
+    }
+    return true;
+}
+
+vector<size_t> make_histogram(const vector<double>& numbers, size_t bin_count)
+{
+    double minN, maxN;
+    find_minmax( numbers, minN, maxN);
+
+    vector <size_t> bins(bin_count);
+    double diff = (maxN - minN) / bin_count;
+    size_t max_count = 0;
+    for (size_t i = 0; i <numbers.size() ; i++)
+    {
+        bool found = false;
+        for (size_t j = 0; (j < bin_count - 1) && !found; j++)
+        {
+            auto lo = minN + j * diff;
+            auto hi = minN + (j + 1) * diff;
+            if ((lo <= numbers[i]) && (hi > numbers[i]))
+            {
+                bins[j]++;
+                if (bins[j] > max_count)
+                {
+                    max_count = bins[j];
+                }
+                found = true;
+            }
+        }
+        if(!found)
+        {
+            bins[bin_count - 1]++;
+            if (bins[bin_count - 1] > max_count)
+            {
+                max_count = bins[bin_count - 1];
+            }
+        }
+    }
+    return bins;
+}