#include "../matplotlibcpp.h"

#include <cmath>

namespace plt = matplotlibcpp;

int main()
{
 std::vector<std::vector<double>> x, y, z;
 for (double i = -5; i <= 5; i += 0.25) {
 std::vector<double> x_row, y_row, z_row;
 for (double j = -5; j <= 5; j += 0.25) {
 x_row.push_back(i);
 y_row.push_back(j);
 z_row.push_back(::std::sin(::std::hypot(i, j)));
 }
 x.push_back(x_row);
 y.push_back(y_row);
 z.push_back(z_row);
 }

 plt::plot_surface(x, y, z);
 plt::show();
}