--- a/main_templates1/drumb.scala	Sat Oct 08 00:30:51 2022 +0100
+++ b/main_templates1/drumb.scala	Tue Nov 01 15:03:48 2022 +0000
@@ -9,66 +9,39 @@
 val rstate_portfolio = List("PLD", "PSA", "AMT", "AIV", "AVB", "BXP", "CCI", 
                             "DLR", "EQIX", "EQR", "ESS", "EXR", "FRT", "HCP") 
 
-
-// (1) The function below takes a stock symbol and a year as arguments.
-//     It should read the corresponding CSV-file and then extract the January 
-//     data from the given year. The data should be collected in a list of
-//     strings (one entry for each line in the CSV-file).
-
 import io.Source
 import scala.util._
 
+// ADD YOUR CODE BELOW
+//======================
+
+
+// (1) 
 def get_january_data(symbol: String, year: Int) : List[String] = ???
 
 
-// (2) From the output of the get_january_data function, the next function 
-//     should extract the first line (if it exists) and the corresponding
-//     first trading price in that year with type Option[Double]. If no line 
-//     is generated by get_january_data then the result is None; and Some if 
-//     there is a price.
-
-
+// (2) 
 def get_first_price(symbol: String, year: Int) : Option[Double] = ???
 
 
-// (3) Complete the function below that obtains all first prices
-//     for the stock symbols from a portfolio (list of strings) and 
-//     for the given range of years. The inner lists are for the
-//     stock symbols and the outer list for the years.
-
-
+// (3) 
 def get_prices(portfolio: List[String], years: Range) : List[List[Option[Double]]] = ???
 
 
 
-// (4) The function below calculates the change factor (delta) between
-//     a price in year n and a price in year n + 1. 
-
+// (4) 
 def get_delta(price_old: Option[Double], price_new: Option[Double]) : Option[Double] = ???
 
 
 
-// (5) The next function calculates all change factors for all prices (from a 
-//     portfolio). The input to this function are the nested lists created by 
-//     get_prices above.
-
+// (5) 
 def get_deltas(data: List[List[Option[Double]]]) :  List[List[Option[Double]]] = ???
 
-
-
-// (6) Write a function that given change factors, a starting balance and an index,
-//     calculates the yearly yield, i.e. new balance, according to our dumb investment 
-//     strategy. Index points to a year in the data list.
-
+// (6) 
 def yearly_yield(data: List[List[Option[Double]]], balance: Long, index: Int) : Long = ???
 
 
-// (7) Write a function compound_yield that calculates the overall balance for a 
-//     range of years where in each year the yearly profit is compounded to the new 
-//     balances and then re-invested into our portfolio. For this use the function and 
-//     results generated under (6). The function investment calls compound_yield
-//     with the appropriate deltas and the first index.
-
+// (7) 
 def compound_yield(data: List[List[Option[Double]]], balance: Long, index: Int) : Long = ???
 
 def investment(portfolio: List[String], years: Range, start_balance: Long) : Long = ???