scala-2.7

I'm an 18 years old trainee and I'm discovering scala which I like very much :-). To get familiar with the scala actors I wrote a small simulation with some gears and one controller. The ActorApplication creates N gears with random speed. The controller calculates a synchronization speed and starts the gear-actors. The gears synchronize to this given speed step by step (1+ or 1-). The simulation is finished when all gears have reached the synchronization speed. I developed the simulation in scala 2.7.7 - and it worked as I expected it (see output below). However, when I swichted to the current

I'm trying to create a trait that, when mixed in, will replace the default definition of a method with one that calls the original method and then manipulates the result. Here's what I'm trying to do: class Foo { def bar() : String = "Foos bar" } trait OtherStuff { self : Foo => def bar() : String = self.bar() + " with OtherStuff" } class Quux extends Foo with OtherStuff If this worked the way I wanted it to, then (new Quux).bar would now return Foos bar with OtherStuff . Unfortunately, it doesn't work that way - what I get is: <console>:6: error: error overriding method bar in class Foo of

Can I "yield" into a Map? I've tried val rndTrans = for (s1 <- 0 to nStates; s2 <- 0 to nStates if rnd.nextDouble() < trans_probability) yield (s1 -> s2); (and with , instead of -> ) but I get the error TestCaseGenerator.scala:42: error: type mismatch; found : Seq.Projection[(Int, Int)] required: Map[State,State] new LTS(rndTrans, rndLabeling) I can see why, but I can't see how to solve this :-/ scala> (for(i <- 0 to 10; j <- 0 to 10) yield (i -> j)) toMap res1: scala.collection.immutable.Map[Int,Int] = Map((0,10), (5,10), (10,10), (1,10), (6,10), (9,10), (2,10), (7,10), (3,10), (8,10), (4,10)