Basic 2D Array Assignment Help

My assignment asks to input a file Matrix.dat which contains a column of values.
ex. Matrix.dat:
3
4
1
2
3
4
5
6
7
8
9
10
11
12

The first value is set to the rows and the second to columns. The rest are inputted into the array a la:
1 2 3 4
5 6 7 8 ... etc.

I've gotten this far and im now stuck :x

#include <cmath>
#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

int main()

{

float Data, Min, Max, MM;
int M, N, I, J;

ifstream File;
File.open("Matrix.dat");

File >> M;
File >> N;

float Matrix[M][N];

File >> Matrix[M][N];



if(M < 1 || M > 15)
{
cout << "Error: Row must be greater than 1 and less than 15." << endl;
return 0;
}

else if(N < 1 || N > 15)
{
cout << "Error: Row must be greater than 1 and less than 15." << endl;
return 0;
}

else{


for(I=0; I<=M-1; I++){
for(J=0; J<=N-1; J++){

cout << Matrix[I][J];


}
cout << endl;
}


}
return 0;
}

(compiled in g++)

After the array has been filled, i also have to normalize it, but that is simple enough once i get the array working.

thanks for your time

Please post your code using the code tags provided to maintain formatting and make it easier to read.

It helps a lot if you can tell us what your code already does and where you are stuck. Do you have compilation errors, runtime errors or just a problem understanding part of it?

-KM-

Instead of
"File >> Matrix[M][N];"
I have used

for(I=0; I<=M-1; I++){
for(J=0; J<=N-1; J++){

File >> Matrix[I][J];

}
}

Each matrix component takes then the right value.