--- a/progs/trade.scala	Tue Nov 08 10:37:18 2016 +0000
+++ b/progs/trade.scala	Wed Nov 09 00:52:08 2016 +0000
@@ -1,67 +1,56 @@
-// Part 2
-
-// (1) the function that calculuates the indices
-// for when to buy the commodity and when to sell
-def trade_times(xs: List[Double]): (Int, Int) = {
-  val low = xs.min
-  val low_index = xs.indexOf(low)
-  val rest = xs.drop(low_index)
-  val high = rest.max
-  val high_index = rest.indexOf(high)
-  (low_index, low_index + high_index)
-}
+// Part 2 about Buy-Low-Sell-High using Yahoo Financial Data
+//===========================================================
 
 
-val prices = List(28.0, 18.0, 20.0, 26.0, 24.0)
+// (1) Complete the function that is given a list of floats
+// and calculuates the indices for when to buy the commodity 
+// and when to sell
 
-trade_times(prices)
-assert(trade_times(prices) == (1, 3), "the first test fails")
+def trade_times(xs: List[Double]): (Int, Int) = ...
+
+
+// an example
+//val prices = List(28.0, 18.0, 20.0, 26.0, 24.0)
+//assert(trade_times(prices) == (1, 3), "the trade_times test fails")
 
 
-import io.Source
-import scala.util._
+// (2) Complete the ``get webpage'' function that takes a
+// a stock symbol as argument and queries the Yahoo server
+// at
+//      http://ichart.yahoo.com/table.csv?s=<<insert stock symbol>>
+// 
+// This servive returns a CSV-list that needs to be separated into
+// a list of strings.
 
-// (2) the function that queries the Yahoo financial data
-// servive and returns a comma-separated-value list
-def get_page(url: String): List[String] = {
-  Try(Source.fromURL(url)("ISO-8859-1").getLines.toList).
-    getOrElse { println(s"  Problem with: $url"); List() }
-}
+def get_page(symbol: String): List[String] = ...
 
-// (3) the function that processes the comma-separated-value list
-// extracting the dates and anjusted close prices
-def process_page(url: String): List[(String, Double)] = {
-  get_page(url).drop(1).map(_.split(",").toList).map((xs) => (xs(0), xs(6).toDouble))
-}
+// (3) Complete the function that processes the CSV list
+// extracting the dates and anjusted close prices. The
+// prices need to be transformed into Doubles.
+
+def process_page(symbol: String): List[(String, Double)] = ...
+
 
-// (4) the function that generates the query for a stock
-// market symbol and returns the dates for when to buy and
-// sell
-def query_comp(name: String): (String, String) = {
-  val list = process_page("""http://ichart.yahoo.com/table.csv?s=""" + name).reverse
-  val (tbuy, tsell) = trade_times(list.map(_._2))
-  (list(tbuy)._1, list(tsell)._1)
-}
+// (4) Complete the query_company function that obtains the
+// processed CSV-list for a stock symbol. It should return
+// the dates for when to buy and sell the stocks of that company.
+
+def query_company(symbol: String): (String, String) =
+
+
+
+// some test cases
 
 //query_comp("GOOG")
 
-
+// some more test cases
+/*
 val indices = List("GOOG", "AAPL", "MSFT", "IBM", "FB", "YHOO", "AMZN", "BIDU")
 
 for (name <- indices) {
   val times = query_comp(name)
   println(s"Buy ${name} on ${times._1} and sell on ${times._2}")
 }
-
-
-
-/*
-scala trade.scala 2> /dev/null || echo "command1 borked it"
-
-command1
-if [ $? -ne 0 ]; then
-    echo "command1 borked it"
-fi
 */