- Use code tags when inserting code.
- You forgot semicolon at end of first line.
- You have to set comma instead of point in between numbers "2" and "3" of first line

```
a=Matrix(2,3);
b=a[0][0];
printf( "type of b is: %s\n", typeof(b) );
printf( "value b is: %g", b );
```

You should read here about what Matrix function is doing.

It creates a matrix with intial value as 3rd argument of that function.

Then you have to fill the matrix with values.

**(Very) basic** example

```
a=Matrix(2,3, intial = NULL );
a[0][0] = 1;// 1st row, 1st column
a[1][0] = 2;// 2nd row, 1st column
a[0][1] = 3;// 1st row, 2nd column
a[1][1] = 4;// 2nd row, 2nd column
a[0][2] = 5;// 1st row, 3rd column
a[1][2] = 6;// 2nd row, 3rd column
printf( MxToString(a) );
b=a[0][0];
printf( "\ntype of b is: %s\n", typeof(b) );
printf( "value b is: %g", b );
```