cs-lab34/histogram.cpp

#include <vector>
#include "histogram.h"
using namespace std;
static void find_minmax(const vector<double>& numbers, double& min, double& max)
{
    min = numbers[0];
    max = numbers[0];
    for (double x : numbers) {
        if (x < min) {
            min = x;
        }
        else if (x > max) {
            max = x;
        }
    }
}

vector<size_t> make_histogram(const vector<double>& numbers, size_t bin_count)
{
    double min,max;
    find_minmax(numbers, min, max);
    vector<size_t> bins(bin_count);
    double bin_size = (max-min)/bin_count;
    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 = min + j * bin_size;
            auto hi = min + (j + 1) * bin_size;
            if ( (numbers[i] >= lo) && (numbers[i] < hi) ) {
                bins[j]++;
                found = true;
            }
        }
        if (!found) {
            bins[bin_count-1]++;
        }

    }
    return bins;
}