surf_4.cpp

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

int main() {
    using namespace matplot;
    auto [X,Y] = meshgrid(iota(-5,0.5,5));
    auto Z = transform(X, Y, [](double x, double y) { return y*sin(x) - x*cos(y); });
    auto C = transform(X, Y, [](double x, double y) { return x * y; });
    surf(X,Y,Z)->face_alpha(0.5).edge_color("none");

    wait();
    return 0;
}