How to assign each row of a text file to a new vector?

Question

I am C++ noob, I have a text file with 4 rows and 3 columns, where each row corresponds to a sensor signal. How do I load each row to a separate vector<float>?

(0.165334,0) (0.166524,-0.0136064) (-0.144899,0.0207161)
(0.205171,0) (0.205084,-0.0139042) (-0.205263,0.0262445)
(0.216684,0) (0.215388,-0.0131107) (-0.193696,0.0251303)
(0.220137,0) (0.218849,-0.0135667) (-0.194153,0.025175) 

This is what I have so far, but this code loads data as string. I want to load my final data as vector<vector<float>>?

vector<vector<string> > input;    
ifstream fileFFT(Filename.c_str());
string line;
while(getline(fileFFT, line)){
    if(line.empty()){
        continue;
    }

    stringstream row(line);
    vector<string> values((istream_iterator<string>(row)),(istream_iterator<string>()));       //end

    input.push_back(values);

}

Answer 1

Here's something to get you started:

class Point
{
public:
  double x;
  double y;
  friend std::istream& operator>>(std::istream& input, Point& p);
};

std::istream& operator>>(std::istream& input, Point& p)
{
  char c;
  input >> c; // Read open parenthesis
  input >> p.x;
  input >> c; // Read comma
  input >> p.y;
  input >> c; // Read closing parenthesis
  return input;
};

//...
std::string row_text;
std::vector<std::vector<Point>> matrix;
while (std::getline(my_file, row_text))
{
  std::vector<Point> row;
  std::istringstream(row_text);
  Point p;
  while (row_text >> p)
  {
    row.push_back(p);
  }
  matrix.push_back(row);
}

I've created a Point class to represent the pair of floating point numbers.

I also overloaded operator>> to make reading a Point easier.

The loop reads one record or text line, then creates a vector of Point from the text line.
The record or row is then appended to the matrix.