How to define a list of lists in Scala?

Question

I would like to create a storage for the following type:

List(List(2.3,1.1),List(2.2, 1))

But if I do the following:

var y         


        

Answer 1

var y:List[List[Double]] = List(List (1.0, 2.2), List(2, 1.1, -2.1))

y(0)(0)*2