question: public static double [ ] [ ] random ( int m , int n ) { double [ ] [ ] matres = new double [ m ] [ ] ; for ( int i = 0 ; i < m ; ++ i ) { matres [ i ] = new double [ n ] ; for ( int j = 0 ; j < n ; ++ j ) { matres [ i ] [ j ] = Math . random ( ) ; } } return ( matres ) ; }
target:  Generates a random m*n matrix object.