Text File Matrix into 2d Vectors

[lastpeony]

its done no need

[coder777]

Use getline(...) in the first loop and stringstream in the second:

  std::vector<std::vector<string>> array;
		std::string line;
		while(getline(filein,line)){ // go through each line
			array.emplace_back(); // an empty line will be created
			stringstream ss{line};
			string num;
			while(getline(ss,num,',')){
			
			array.back().push_back(num);
			cout << array.back().back() << endl;
			}
		}

Not tested

For stringstream see:
http://www.cplusplus.com/reference/sstream/stringstream/?kw=stringstream