diff -r 19b75e899d37 -r 9c03b5e89a2a main_testing2/danube_test6.scala
--- a/main_testing2/danube_test6.scala	Fri Apr 26 17:29:30 2024 +0100
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,44 +0,0 @@
-
-import M2._
-
-// first test 
-
-def urban_groupById(ratings: List[(String, String)], 
-              m: Map[String, List[String]]) : Map[String, List[String]] = ratings match {
-  case Nil => m
-  case (id, mov) :: rest => {
-    val old_ratings = m.getOrElse (id, Nil)
-    val new_ratings = m + (id -> (mov :: old_ratings))
-    urban_groupById(rest, new_ratings)
-  }
-}
-
-//def urban_groupById(ratings: List[(String, String)]) = 
-//  ratings.groupBy(_._1).view.mapValues(_.map(_._2)).toMap 
-
-def urban_get_csv_file(name: String) : List[String] = {
-  import io.Source
-  import scala.util._
-  val csv = Source.fromFile(name)("ISO-8859-1")
-  csv.mkString.split("\n").toList.drop(1)
-}
-
-def urban_process_ratings(lines: List[String]) : List[(String, String)] = {
-  for (cols <- lines.map(_.split(",").toList); 
-       if (cols(2).toInt >= 4)) yield (cols(0), cols(1))  
-}
-
-def urban_process_movies(lines: List[String]) : List[(String, String)] = {
-  for (cols <- lines.map(_.split(",").toList)) yield (cols(0), cols(1))  
-}
-
-
-val urban_good_ratings = urban_process_ratings(urban_get_csv_file("ratings.csv"))
-val urban_movie_names = urban_process_movies(urban_get_csv_file("movies.csv")).toMap
-
-val urban_ratings_map = urban_groupById(urban_good_ratings, Map())
-
-assert((for (n <- List("1", "2", "3", "4", "5")) yield {
-  recommendations(urban_ratings_map, urban_movie_names, n).length
-}) == List(2, 2, 2, 0, 2))
-