diff -r 6253f4681451 -r a7afc2540a88 progs/drumb.scala --- a/progs/drumb.scala Wed Nov 09 15:07:23 2016 +0000 +++ b/progs/drumb.scala Thu Nov 10 00:15:14 2016 +0000 @@ -1,5 +1,5 @@ -// Advanvced Part 3 about Mr T. Drumb investing into stocks -//========================================================== +// Advanvced Part 3 about really dump investing strategy +//======================================================= //two test portfolios @@ -8,34 +8,55 @@ "DLR", "EQIX", "EQR", "ESS", "EXR", "FRT", "GGP", "HCP") -def get_yahoo_page(url: String): Option[List[String]] = ... +// (1) The function below should obtain the first trading price +// for a stock symbol by using the query +// +// http://ichart.yahoo.com/table.csv?s=<>&a=0&b=1&c=<>&d=1&e=1&f=<> +// +// and extracting the first January Adjusted Close price in a year. def get_first_price(symbol: String, year: Int): Option[Double] = ... +// Complete the function below that obtains all first prices +// for the stock symbols from a portfolio for the given +// range of years + def get_prices(portfolio: List[String], years: Range): List[List[Option[Double]]] = ... +// test case +//val p = get_prices(List("GOOG", "AAPL"), 2010 to 2012) + -//val p = get_prices(List("GOOG", "AAPL"), 2010 to 2012) - +// (2) The first function below calculates the change factor (delta) between +// a price in year n and a price in year n+1. The second function calculates +// all change factors for all prices (from a portfolio). def get_delta(price_old: Option[Double], price_new: Option[Double]): Option[Double] = ... def get_deltas(data: List[List[Option[Double]]]): List[List[Option[Double]]] = ... +// test case using the prices calculated above //val d = get_deltas(p) +// (3) Write a function that given change factors, a starting balance and a year +// calculates the yearly yield, i.e. new balanace, according to our dump investment +// strategy. Another function calculates given the same data calculates the +// compound yield up to a given year. Finally a function combines all +// calculations by taking a portfolio, a range of years and a start balance +// as arguments. def yearly_yield(data: List[List[Option[Double]]], balance: Long, year: Int): Long = ... +//test case //yearly_yield(d, 100, 0) def compound_yield(data: List[List[Option[Double]]], balance: Long, year: Int): Long = ... - def investment(portfolio: List[String], years: Range, start_balance: Long): Long = ... +//test cases for the two portfolios given above //investment(rstate_portfolio, 1978 to 2016, 100) //investment(blchip_portfolio, 1978 to 2016, 100)