text: #include <cmath>
  #include <matplot/matplot.h>
  
  int main() {
      using namespace matplot;
  
      fmesh([](double x, double y) { return erf(x) + cos(y); }, std::array<double,4>{-5,0,-5,5});
      hold(on);
      fmesh([](double x, double y) { return sin(x) + cos(y); }, std::array<double,2>{0,5}, std::array<double,2>{-5,5});
      hold(off);
  
      wait();
      return 0;
  }