diff -r 50a3b874008a -r 1616d06a0893 testing1/drumb.scala
--- a/testing1/drumb.scala	Sat Dec 15 13:46:54 2018 +0000
+++ b/testing1/drumb.scala	Sat Dec 15 23:58:12 2018 +0000
@@ -153,4 +153,15 @@
 //}
 
 
+//val ds = get_deltas(get_prices(List("GOOG", "AAPL"), 2010 to 2012))
+//yearly_yield(ds, 100, 0)  => 125
+//yearly_yield(ds, 100, 1)  => 117
 
+//investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2000, 100) // => 100
+//investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2001, 100) // => 27
+//investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2002, 100) // => 42
+//investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2003, 100) // => 27
+//investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2004, 100) // => 38
+//investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2005, 100) // => 113
+//investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2006, 100) // => 254
+//investment(List("GOOG", "AAPL", "BIDU"), 2000 to 2007, 100) // => 349