public static double [ ] getDiagonal ( final double [ ] [ ] m1 ) { final int dim = Math . min ( getColumnDimensionality ( m1 ) , m1 . length ) ; final double [ ] diagonal = new double [ dim ] ; for ( int i = 0 ; i < dim ; i ++ ) { diagonal [ i ] = m1 [ i ] [ i ] ; } return diagonal ; }
getDiagonal returns array of diagonal - elements .