TestFor.scala

package org.fjr.test

object TestFor extends App {

  val m: List[List[Int]] = List(
    List(3, 4, 4),
    List(3, 12, 56),
    List(123, 3, 4))

  val n: List[List[Int]] = List(List(12, 4, 55),
    List(123, 4, 4), List(12, 345, 44))

    prints(m)
    prints(n)
    
  val trn = List.transpose(n)

  val result = for (i <- m) yield {
    for (j <- trn) yield {
      (0 /: List.map2(i, j)(_ * _))(_ + _)
    }
  }

  prints(result)
  
  def prints(rs: List[List[Int]])  = {
    rs.foreach(b => {
      b.foreach(b => print(b + " | "))
      println
    })
    println 
  }
}