c++11 - vector adds CSV column data into vector rows while transfering CSV file's data into c++ vector -

i trying add csv file 2d array vector i.e: vector of vector. following program works there small problem,

for example add following csv data:

1.4,23.44,24.4,3.0 2.3,4.3,44.5,6.6 3.4,33.2,5.4,3.65 

i have used following code:

void table::addtabledata(string filename)     vector<vector<float> > vec;          ifstream file(filename.c_str());               bool first = false;             if (file)             {                 string line;                  while (getline(file,line)) //reading data line line                 {                     istringstream split(line);                     float value;                     int col = 0;                     char sep;                  while (split >> value) //                 {                     if(!first)                     {                         // each new value read on line 1 should create new inner vector                         vec.push_back(std::vector<float>());                     }                      vec[col].push_back(value);                     ++col;                      // read past separator                     split>>sep;                 }                  // finished reading line 1 , creating many inner                 // vectors required                 first = true;             } 

however, above code executes , adds data vector, rather adding each value in first line in inner vector adds column row in inner vector. mean rows , column in csv file becomes column , rows in vector respectively. if cout following result

1.4 2.3 3.4 23.44 4.3 33.2 24.4 44.5 5.4  3.0 6.6 3.65    

therefore. row , column reversed, how turn things around.

thank looking @ probelm.

just add each row vector, , push back, instead of adding each vector each time:

while (getline(file,line)) //reading data line line {     std::vector<float> nextrow;      // etc.     while (split >> value)     {         nextrow.push_back(value);         split >> sep;     }      vec.push_back(nextrow); }