cs-lab34/histogram.cpp

#include "histogram.h"
bool
find_minmax(std::vector<double> numbers, double& min, double& max) {
    if(numbers.size() == 0){
        return false;
    }
    min = numbers[0];
    max = numbers[0];
    for (double x : numbers) {
        if (x < min) {
            min = x;
        }
        else if (x > max)
        {
                max = x;
        }
    }
    return true;
}
std::vector<size_t>
make_histogram(const std::vector<double>& numbers,size_t bin_count){
    std::vector<size_t> bins(bin_count);
    double min,max;
    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;
}