question: public Matrix ( final double [ ] [ ] data , final Set < Address . Flags > flags ) { super ( data . length , data [ 0 ] . length , null ) ; this . addr = new DirectMatrixAddress ( this . $ , 0 , data . length , null , 0 , data [ 0 ] . length , flags , true , data . length , data [ 0 ] . length ) ; for ( int row = 0 ; row < data . length ; row ++ ) { System . arraycopy ( data [ row ] , 0 , this . $ , row * this . cols , this . cols ) ; } }
target:  Creates a Matrix given a double[][] array