fsurf_2.cpp

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

int main() {
    using namespace matplot;

    fsurf([](double x, double y) { return erf(x) + cos(y); }, {-5, 0, -5, 5});
    hold(on);
    fsurf([](double x, double y) { return sin(x) + cos(y); }, {0, 5}, {-5, 5});
    hold(off);

    show();
    return 0;
}