cs-lab34/histogram.cpp

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

void
find_minmax(const std::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;}
    }
    }

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