cs-lab34/histogram.cpp

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

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