105 lines
2.6 KiB
C++
105 lines
2.6 KiB
C++
#include <array>
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#include <cmath>
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#include <numbers>
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#include <fstream>
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template <typename T, std::size_t N> struct signal : public std::array<T, N> {
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constexpr signal() {}
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constexpr signal(float begin, float end) {
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float step = (end - begin) / (N - 1);
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for (std::size_t i = 0; i < N; i++) {
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this->at(i) = begin + i * step;
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}
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}
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constexpr signal(const std::array<T, N> &x, auto fun) {
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for (std::size_t i = 0; i < N; i++) {
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this->at(i) = fun(x.at(i));
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}
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}
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constexpr signal(const signal &sig, auto fun) {
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for (std::size_t i = 0; i < N; i++) {
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this->at(i) = fun(sig.at(i));
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}
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}
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constexpr signal operator+(const T &t) const {
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return signal(*this, [&](T elem) { return elem + t; });
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};
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constexpr signal operator-(const T &t) const {
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return signal(*this, [&](T elem) { return elem - t; });
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};
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constexpr signal operator*(const T &t) const {
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return signal(*this, [&](T elem) { return elem * t; });
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};
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constexpr signal operator/(const T &t) const {
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return signal(*this, [&](T elem) { return elem / t; });
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};
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constexpr signal operator+(const signal &sig) const {
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signal ret;
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for (std::size_t i = 0; i < N; i++) {
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ret.at(i) = this->at(i) + sig.at(i);
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}
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return ret;
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};
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constexpr signal operator-(const signal &sig) const {
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signal ret;
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for (std::size_t i = 0; i < N; i++) {
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ret.at(i) = this->at(i) - sig.at(i);
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}
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return ret;
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};
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friend constexpr signal operator+(const T& t, const signal& sig) {
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return sig + t;
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}
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friend constexpr signal operator*(const T& t, const signal& sig) {
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return sig * t;
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}
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friend constexpr signal operator/(const T& t, const signal& sig) {
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signal ret;
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for (std::size_t i = 0; i < N; i++) {
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ret.at(i) = t / sig.at(i);
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}
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return ret;
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}
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};
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int main() {
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constexpr float A = 1.18090254918130e-3;
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constexpr float B = 2.16884014794388e-4;
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constexpr float C = 1.90058756197216e-6;
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constexpr float D = 1.83161892641824e-8;
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constexpr int c_lut_points = 50;
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constexpr signal<float, c_lut_points> resistance(1e3, 10e3);
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constexpr auto temperature_k = 1 / (A +
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B * signal(resistance, [](float x) {return std::log(x);}) +
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C * signal(resistance, [](float x) {return std::pow(std::log(x), 2);}) +
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D * signal(resistance, [](float x) {return std::pow(std::log(x), 3);}));
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constexpr auto temperature_celsius = temperature_k - 273.15f;
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std::ofstream file("out.csv");
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for(int i = 0; i < c_lut_points; i++) {
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file << resistance[i] << ", " << temperature_celsius[i] << "\n";
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}
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return 0;
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}
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