string d;
char v[1024];
char *ptr;
while(getline( file, d ))
{
	strcpy(v,d.c_str());
	ptr=strtok(v,",");
	x1=0;

         while (ptr !=NULL)
	   {
		if(y<x)
		{
		   float u;
		   [b]u = (float)atof(ptr);[/b]
	           N[x1].push_back(u);
		   x1++;
	         }
	     ptr = strtok(NULL,",");
	     y++;
	   }
        y=0;

		
}

#include <iostream>
using namespace std;

#include<string>
#include<fstream>

int main() {
	char v[1024];
	char *ptr;
	float u;

	string d;
	ifstream file ("test1");
	if (file.is_open())
	{
		while (! file.eof() )
		{
			getline (file,d);
			strcpy(v,d.c_str());
			cout << endl;
			ptr=strtok(v,",");
			while (ptr !=NULL)
			{
				u = (float)atof(ptr);
				cout << ptr <<"\t";
				ptr = strtok(NULL,",");

			}
		}
		file.close();
	}

	else cout << "Unable to open file";

	cout << endl;
	return 0;
}