Can I use for-comprehenion / yield to create a map in Scala?

Question

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 :-/

Answer 1

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))