//val urban_deltas = get_deltas(get_prices(List("GOOG", "AAPL"), 2010 to 2012))
/*
def myassert(cond : => Boolean) = {
try {
assert(cond)
} catch {
case _ : Throwable => System.exit(1)
}
}
*/
val ds_urban = List(List(Some(-0.03573991804411003), Some(0.539974575389325)),
List(Some(0.10103414222249969), Some(0.24777764141006836)))
assert(CW6b.yearly_yield(ds_urban, 100, 0) == 125)
assert(CW6b.yearly_yield(ds_urban, 100, 1) == 117)