public double [ ] [ ] toArray ( ) { int m = data . size ( ) ; double [ ] [ ] a = new double [ m ] [ ncols ( ) ] ; for ( int i = 0 ; i < m ; i ++ ) { for ( SparseArray . Entry item : get ( i ) . x ) { a [ i ] [ item . i ] = item . x ; } } return a ; }
Returns a dense two - dimensional array containing the whole matrix in this dataset in proper sequence .