method1

ifstream in_source(source_file_full_path);
if(!in_source)
{
     cout<<"Cannot open the file!"<<endl;
     cin.get();
}
else
{
     while (!in_source.eof())
     {
             getline(in_source, name_source);
	     result_source = split(name_source, pattern_source);
	     if (name_source.empty() || stod(result_source[1]) == 0.0)
             {
                   continue;
	     }
             if (stod(result_source[0]) < source_data_min || stod(result_source[0]) > source_data_max)
             {
                   continue;
             }
             dataSetX_source.push_back(stod(result_source[0]));
             dataSetY_source.push_back(stod(result_source[1]));
     }
     in_source.close();
}
NUMDATA_source=dataSetX_source.size();