2 D Vectors(Vector of Vectors) giving problem

[sagarG]

class input_for_matrix {
	private:
		. . .
	public: 
		 vector <vector <double> > input ;
                int lenFinder (char *arg1)
                {
                 ....//input is not used here
                }
          vector< vector<double> > *putinArray (char *arg1, int size)  /*This method puts numbers read from file into the array*/
           {
                input.resize(size);
		for (int i=0 ; i < size ; i++) input[i].resize(size + 1) ;
                if (myfile.is_open())  
		  {
		    while ( myfile.good() )
		    {
		      for (int i=0 ; i<size  ; i++)
		   	{
			 for (int j=0 ; j<=size  ; j++)
 			{
			      getline (myfile,line);
			       if ( isdigit(line[1]) ) 
				{ 
				 input[i][j] = atof(line.c_str());
		 cout << "input["<<i<<"]["<<j<<"]=" << input[i][j] << "\t";
				}
			}//inner for ends
			cout << endl ;
			}//outer for ends
			break;
		    }//while ends
	    myfile.close();
	    return &input;
	}//if ends
      }//putinArray ends here
};//class ends here

//This is in some other file with different inherited class
class Guass_El : public input_for_matrix {...};
int main(..)
{
	vector <vector <double> > *fn ;
    fn=obj1->putinArray(argv[1],size1);	//now fn is pointer to vector of vectors
cout << "The (2,3)nd element is  " << *(fn [1][2] ) << endl;/*This is what giving me error, I exactly don't know, but this is how elements should be accessed*/
}

error: no match for ‘operator*’ in ‘*(fn + 12u)->std::vector<_Tp, _Alloc>::operator[] [with _Tp = std::vector<double>, _Alloc = std::allocator<std::vector<double> >, std::vector<_Tp, _Alloc>::reference = std::vector<double>&, std::vector<_Tp, _Alloc>::size_type = unsigned int](2u)’

So could you please help me..? I am tired of thinking what is going wrong. Of course, I donot want to use 'fn' to access only 1 element. I will put it in the for loop to manipulate it, but for loop will only have indices i and j and this is what statement will eventually be.

So please please help me to access the elements of this vector of vectors.

Thanks in advance
Sagar

[therockon7throw]

Hi

What is the type of fn ? where does obj1 come from ?
why do you define fn as a pointer to a vector, make it a normal one, without pointer
and how to you set your, fn, vector to a temporary reference( I dont see obj1 in your main, nor in gloabl scope)? is &input out of it's scope alive ?
is it not destroyed ?
your program should work if putinArray returns a vector< vector<double> >, and not a reference, and if fn is not a pointer


hope it helps