1 

     2 

     3 val trades = List(28.0, 18.0, 20.0, 26.0, 24.0)

     4 

     5 def trade_times(xs: List[Double]): (Int, Int) = {

     6   val low = xs.min

     7   val low_index = xs.indexOf(low)

     8   val rest = xs.drop(low_index)

     9   val high = rest.max

    10   val high_index = rest.indexOf(high)

    11   (low_index, low_index + high_index)

    12 }

    13 

    14 

    15 trade_times(trades)

    16 

    17 assert(trade_times(List(10.0, 8.0, 7.0, 6.0)) == (3, 3), "the first test fails")

    18 

    19 

    20 

    21 import io.Source

    22 import scala.util._

    23 

    24 def get_page(url: String): List[String] = {

    25   Try(Source.fromURL(url)("ISO-8859-1").getLines.toList).

    26     getOrElse { println(s"  Problem with: $url"); List() }

    27 }

    28 

    29 def process_page(url: String): List[(String, Double)] = {

    30   get_page(url).drop(1).map(_.split(",").toList).map((xs) => (xs(0), xs(6).toDouble))

    31 }

    32 

    33 def query_comp(name: String): (Int, Int) = {

    34   val list = process_page("""http://ichart.yahoo.com/table.csv?s=""" + name)

    35   trade_times(list.reverse.map(_._2))

    36 }

    37 

    38 

    39 val indices = List("GOOG", "AAPL", "MSFT", "IBM", "FB", "YHOO", "AMZN", "BIDU")

    40 

    41 indices.map(query_comp(_))

    42 

    43 val appl_page = get_page("""http://ichart.yahoo.com/table.csv?s=GOOG""")

    44 val goog_page = get_page("""http://ichart.yahoo.com/table.csv?s=GOOG""")

    45 goog_page.length

    46 

    47 val pairs = goog_page.drop(1).map(_.split(",").toList).map((xs:List[String]) => (xs(0), xs(6).toDouble))

    48 

    49 pairs.map(_._2)

    50 

    51 trade_times(pairs.reverse.map(_._2))

    52 

    53 pairs(3067)

    54 pairs(11)

    55 

    56 

    57 /*

    58 scala trade.scala 2> /dev/null || echo "command1 borked it"

    59 

    60 command1

    61 if [ $? -ne 0 ]; then

    62     echo "command1 borked it"

    63 fi

    64 */

    65 

    66