cpp/utils/ranges.cpp

//
// Created by dominik on 8/14/24.
//


#include <vector>
#include <algorithm>
#include <cmath>

#include "ranges.h"


std::vector<double> arange(const int size, const double spacing=1.) {
    std::vector<double> out(size);
    std::generate(out.begin(), out.end(), [n = 0, spacing]() mutable { return n++ * spacing; });

    return out;
}

std::vector<double> linspace(const double start, const double stop, const int steps) {
    std::vector<double> range;

    if (steps == 0) {
        return range;
    }

    if (steps == 1) {
        range.push_back(start);
        return range;
    }

    const double stepsize = (stop-start) / (steps-1);
    for (int i=0; i<steps; i++) {
        range.push_back(start + stepsize * i);
    }
    return range;
}


std::vector<double> logspace(const double start, const double stop, const int steps) {
    std::vector<double> range;

    if (steps == 0) {
        return range;
    }

    if (steps == 1) {
        range.push_back(start);
        return range;
    }

    const double logstart = std::log10(start);
    const double logstop = std::log10(stop);

    const double stepsize = (logstop-logstart) / (steps-1);
    for (int i=0; i<steps; i++) {
        range.push_back(pow(10, logstart + stepsize * i));
    }
    return range;
}