[英]Merge two one dimensional String arrays to a single array with delimiter
[英]Scala: merge two arrays in one single structure
我有两个数组:
val diceProbDist = new Array[Double](2 * DICE + 1)
和
val diceExpDist = new Array[Double](2 * DICE + 1)
我想合并一个单一的结构(某种元组,也许):
(0, 0.0, 0,0)(1, 0.0, 0.0)(2, 0.02778, 0.02878)...
其中第一个条目是数组索引,第二个条目是第一个数组值,第三个条目是第二个数组值。
是否有一些scala函数可以实现(使用地图或类似的拉链)?
谢谢,ML
val diceProbDist = Array(0.1, 0.2, 0.3)
val diceExpDist = Array(0.11, 0.22, 0.33)
diceProbDist
.zip(diceExpDist)
.zipWithIndex
.map { case ((v1, v2), i) => (i, v1, v2) }
// result: Array((0,0.1,0.11), (1,0.2,0.22), (2,0.3,0.33))
如果你不介意的话,简单for
理解也应该成功:
for {
index <- 0 until math.min(diceExpDist.length, diceProbDist.length)
} yield (index, diceProbDist(index), diceExpDist(index))
另一个解决方案,类似于tkachuko的一个没有理解的
val diceProbDist = List(0.1, 0.2, 0.3)
val diceExpDist = List(0.11, 0.22, 0.33)
val range = 0 until math.min(diceExpDist.length, diceProbDist.length)
range.map { idx => (idx, c(idx), d(idx)) }
// result : res0: List[(Int, Int, Int)] = List((0,0,11), (1,1,12), (2,2,13), (3,3,14), (4,4,15), (5,5,16), (6,6,17), (7,7,18), (8,8,19), (9,9,20))
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