Question

val reslist = List(200.0,-100.00,50.80,-400.83, 800.003,-6.513214114672146E85, -1.2425461624057028E86, -4.7624471630469706E86, -3.6046499228286203E86, 0.0, -8.833653923554989E85, 0.000, -4.795843631190487E85, -5.34142100270833E86, -3.48087737474366E85, -2.811146396971388E86, -6.923235225460886E86, -6.513214114672146E85, 0.00000, -1.2425461624057028E86, -7.073704018243951E85, -9.633244016491059E86, -1.1418901590222212E86, -2.115257701350766E86, -1.1418901590222212E86, -3.48087737474366E85,-1.0676381955303372E86,500.56, 2.900556,400.56,-48956.00,4509.0005); 

val weightlistzi = reslist.zipWithIndex 
// List((200.0,0), (-100.0,1), (50.8,2), (-400.83,3), (800.003,4), (-6.513214114672146E85,5), (-1.2425461624057028E86,6), (-4.7624471630469706E86,7), (-3.6046499228286203E86,8), (0.0,9), (-8.833653923554989E85,10), (0.0,11), (-4.795843631190487E85,12), (-5.34142100270833E86,13), (-3.48087737474366E85,14), (-2.811146396971388E86,15), (-6.923235225460886E86,16), (-6.513214114672146E85,17), (0.0,18), (-1.2425461624057028E86,19), (-7.073704018243951E85,20), (-9.633244016491059E86,21), (-1.1418901590222212E86,22), (-2.115257701350766E86,23), (-1.1418901590222212E86,24), (-3.48087737474366E85,25), (-1.0676381955303372E86,26), (500.56,27), (2.900556,28), (400.56,29), (-48956.0,30), (4509.0005,31)) 

// I am sorting it here.
val resultlist = weightlistzi.sortWith { (x: (Double,Int), y: (Double,Int)) => x._1 > y._1 }

以下是结果列表。如你所见，-100.0，-400.83，-48956.0发生在-3之前，其余的......

// List[(Double, Int)] = List((4509.0005,31), (800.003,4), (500.56,27), (400.56,29), (200.0,0), (50.8,2), (2.900556,28), (0.0,9), (0.0,11), (0.0,18), (-100.0,1), (-400.83,3), (-48956.0,30), (-3.48087737474366E85,14), (-3.48087737474366E85,25), (-4.795843631190487E85,12), (-6.513214114672146E85,5), (-6.513214114672146E85,17), (-7.073704018243951E85,20), (-8.833653923554989E85,10), (-1.0676381955303372E86,26), (-1.1418901590222212E86,22), (-1.1418901590222212E86,24), (-1.2425461624057028E86,6), (-1.2425461624057028E86,19), (-2.115257701350766E86,23), (-2.811146396971388E86,15), (-3.6046499228286203E86,8), (-4.7624471630469706E86,7), (-5.34142100270833E86,13), (-6.923235225460886E86,16), (-9.633244016491059E86,21))

Answer 1

您的号码中有E个字符。这是Scientific notation。

-1.1E86表示-1.1 * (10^86)。 -1.1 * (10^86)小于-400.83（-4.0083 * 10^2）。

scala sortWith：负数没有被排序

1 个答案: