scala 借助数组实现数据序列的错位相减
作者:互联网
object test{
def main(args: Array[String]): Unit = {
println("Hello Spark")
val arrayBuffer=ArrayBuffer[Int](1,2,3,5,9,12)
val out = arrayBuffer.indices.map(index => {
val x1 = index - 1
val x2 = index
index match {
// 头节点单独处理,其余元素根据下标从数组中取值进行计算
case index if 1 until arrayBuffer.length contains index => (index, arrayBuffer.apply(x2)- arrayBuffer.apply(x1))
case _ => (index, 0)
}
})
out.foreach(println)
}
}
Hello Spark
(0,0)
(1,1)
(2,1)
(3,2)
(4,4)
(5,3)
标签:index,错位,相减,val,scala,arrayBuffer,apply,Spark,out 来源: https://blog.csdn.net/az9996/article/details/120451944