mesh_2.cpp

#include <cmath>
#include <matplot/matplot.h>

int main() {
    using namespace matplot;
    auto [X,Y] = meshgrid(iota(-8,.5,+8));
    auto Z = transform(X, Y, [](double x, double y) {
        double eps = std::nextafter(0.0,1.0);
        double R = sqrt(pow(x,2)+pow(y,2)) + eps;
        return sin(R)/R;
    });
    auto C = transform(X, Y, [](double x, double y) {
        return x*y;
    });
    mesh(X,Y,Z,C);

    wait();
    return 0;
}