public Vector3 GetRow( int index )
{
if ( ( index < 0 ) || ( index > 2 ) )
throw new ArgumentException( "Invalid row index was specified.", "index" );
return ( index == 0 ) ? new Vector3( V00, V01, V02 ) :
( index == 1 ) ? new Vector3( V10, V11, V12 ) : new Vector3( V20, V21, V22 );
}