提问人:princess of persia 提问时间:2/24/2013 更新时间:2/24/2013 访问量:300
Scala 将序列合并为三元组 [复制]
Scala Combine Sequences into triples [duplicate]
问:
我有 3 个 IndexedSequences,我想将它们组合如下:
indSeq1 = (a,b,c)
indSeq2 = (1,2,3)
indSeq3 = (!,@,#)
result:([a,1,!],[b,2,@],[c,3,#])
我使用了zipped,但我得到了如何在scala中做到这一点,我希望输出也是IndexedSequence。([a,b,c],[1,2,3],[!,@,#])
答:
0赞
jonathanasdf
2/24/2013
#1
尝试在压缩后运行转置。
2赞
Daniel C. Sobral
2/24/2013
#2
这不是我这样做时得到的:
scala> val indSeq1 = Seq('a', 'b', 'c')
indSeq1: Seq[Char] = List(a, b, c)
scala> val indSeq2 = Seq(1,2,3)
indSeq2: Seq[Int] = List(1, 2, 3)
scala> val indSeq3 = Seq('!', '@', '#')
indSeq3: Seq[Char] = List(!, @, #)
scala> (indSeq1, indSeq2, indSeq3).zipped
res30: scala.runtime.Tuple3Zipped[Char,Seq[Char],Int,Seq[Int],Char,Seq[Char]] = scala.runtime.Tuple3Zipped@9789aa5f
scala> res30.toSeq
res31: Seq[(Char, Int, Char)] = Stream((a,1,!), ?)
scala> res30.toList
res32: List[(Char, Int, Char)] = List((a,1,!), (b,2,@), (c,3,#))
scala> res30.toIndexedSeq
res33: scala.collection.immutable.IndexedSeq[(Char, Int, Char)] = Vector((a,1,!), (b,2,@), (c,3,#))
2赞
Eastsun
2/24/2013
#3
只需使用以下方法:invert
Tuple3
scala> val s1 = IndexedSeq('a', 'b', 'c')
s1: IndexedSeq[Char] = Vector(a, b, c)
scala> val s2 = Seq(1, 2, 3)
s2: Seq[Int] = List(1, 2, 3)
scala> val s3 = Seq('!, '@, '#)
s3: Seq[Symbol] = List('!, '@, '#)
scala> (s1, s2, s3).invert
res0: IndexedSeq[(Char, Int, Symbol)] = Vector((a,1,'!), (b,2,'@), (c,3,'#))
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