public ConcatVector newEmptyClone ( ) { ConcatVector clone = new ConcatVector ( getNumberOfComponents ( ) ) ; for ( int i = 0 ; i < pointers . length ; i ++ ) { if ( pointers [ i ] != null && ! sparse [ i ] ) { clone . pointers [ i ] = new double [ pointers [ i ] . length ] ; clone . sparse [ i ] = false ; } } return clone ; }
Creates a ConcatVector whose dimensions are the same as this one for all dense components but is otherwise completely empty . This is useful to prevent resizing during optimizations where we re adding lots of sparse vectors .