Method plot

tutorials/verify/verify.cpp:7068–7105

  template<typename Closure>
  void VerifyApplication::plot(std::vector<Ref<Benchmark>> benchmarks, const FileName outFileName, std::string xlabel, size_t startN, size_t endN, float f, size_t dn, const Closure& test)
  {
    std::fstream plot;
    plot.open(outFileName, std::fstream::out | std::fstream::trunc);
    plot << "set key inside right top vertical Right noreverse enhanced autotitles box linetype -1 linewidth 1.000" << std::endl;
    plot << "set samples 50, 50" << std::endl;
    plot << "set title \"" << outFileName.name() << "\"" << std::endl; 
    plot << "set xlabel \"" + xlabel + "\"" << std::endl;
    if (f != 1.0f) plot << "set logscale x" << std::endl;
    if (benchmarks.size()) {
      plot << "set ylabel \"" << benchmarks[0]->unit << "\"" << std::endl;
      plot << "set yrange [0:]" << std::endl;

      plot << "plot \\" << std::endl;
      for (size_t i=0; i<benchmarks.size(); i++) {
        plot << "\"" << outFileName.name() << "." << benchmarks[i]->name << ".txt\" using 1:2 title \"" << benchmarks[i]->name << "\" with lines";
        if (i != benchmarks.size()-1) plot << ",\\";
        plot << std::endl;
      }
    }
    plot << std::endl;
    plot.close();
    
    for (auto benchmark : benchmarks) 
    {
      std::fstream data;
      data.open(outFileName.name()+"."+benchmark->name+".txt", std::fstream::out | std::fstream::trunc);
      std::cout << benchmark->name << std::endl;
      for (size_t i=startN; i<=endN; i=size_t(i*f)+dn) 
      {
        size_t N = i;
        Statistics stat = test(benchmark,N);
        data << " " << N << " " << stat.getAvg() << std::endl;
        std::cout<< " " << N << " " << stat.getAvg() << std::endl;
      }
      data.close();
    }
  }

  int VerifyApplication::main(int argc, char** argv) try
  {