question: @ Override public Instance mergeInstance ( Instance inst ) { int [ ] indices = new int [ numValues ( ) + inst . numValues ( ) ] ; int m = 0 ; for ( int j = 0 ; j < numValues ( ) ; j ++ ) { indices [ m ++ ] = index ( j ) ; } for ( int j = 0 ; j < inst . numValues ( ) ; j ++ ) { if ( inst . valueSparse ( j ) != 0 ) { indices [ m ++ ] = numAttributes ( ) + inst . index ( j ) ; } } if ( m != indices . length ) { int [ ] newInd = new int [ m ] ; System . arraycopy ( indices , 0 , newInd , 0 , m ) ; indices = newInd ; } return new BinarySparseInstance ( 1.0 , indices , numAttributes ( ) + inst . numAttributes ( ) ) ; }
target:  Merges this instance with the given instance and returns the result. Dataset is set to null.