// Next return current index and advance
Next return current index and advance
// Next return current index and advance
func (it *DenseIterator) Next() (i int, e error) {
	i = it.index
	if i >= len(it.t.data.([]float64)) {
		e = ErrEndReached
	}
	it.index++
	return i, e
}
func ( it * DenseIterator ) Next ( ) ( i int , e error ) { i = it . index if i >= len ( it . t . data . ( [ ] float64 ) ) { e = ErrEndReached } it . index ++ return i , e }
Next return current index and advance
Next return current index and advance