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