cs-lab34-old/histogram.cpp

#include "histogram.h"
#include <vector>

static void
find_minmax(const std::vector<double>& numbers, double& min, double& max){
    min = numbers[0];
    max = numbers[0];
    for (auto x : numbers) {
        if (x < min) {
            min = x;
        }
        else if (x > max) {
            max = x;
        }
    }
}
std::vector<size_t>
make_histogram(const std::vector<double>& numbers, size_t bin_count){
    double min, max;
    find_minmax (numbers, min, max);
    double bin_size = (max - min) / bin_count;
    std::vector<size_t> bins(bin_count);
    for (auto x : numbers) {
        bool found = false;
        for (size_t j = 0; (j < bin_count - 1) && !found ; j++) {
            if ((min + j * bin_size <= x) && (x < min + (j + 1) * bin_size)) {
                bins[j] += 1;
                found = true;
            }
        }
        if (!found) bins[bin_count - 1]++;
    }
    return bins;
}