def assginFlag(aizmuth:Double):Option[Int] = {val interval = 0.5val index =(aizmuth / interval ).toIntif (index >= 0 && index <= 720 ) Some(index + 1) else None}

assginFlag方法中的条件判断条件 (index >= 0 && index < 720) 返回的是一个布尔值，需要返回一个Option[Int]类型。将判断条件改为 if (index >= 0 && index < 720) Some(index) else None 来返回一个Option[Int]

def assignFlag(azimuth: Double): Option[Int] = {val interval = 0.5val index = (azimuth / interval).toIntif (index >= 0 && index < 720) Some(index) else None}