1 // Part 2 about Alcohol-Consumption Worldwide |
1 // Part 2 about Alcohol-Consumption Worldwide |
2 //============================================ |
2 //============================================ |
3 |
3 |
4 |
4 object CW6b { |
5 // (1) Complete the function that is given a list of floats |
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6 // and calculuates the indices for when to buy the commodity |
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7 // and when to sell |
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8 |
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9 |
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10 // (2) Complete the ``get webpage'' function that takes a |
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11 // a stock symbol as argument and queries the Yahoo server |
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12 // at |
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13 // http://ichart.yahoo.com/table.csv?s=<<insert stock symbol>> |
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14 // |
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15 // This servive returns a CSV-list that needs to be separated into |
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16 // a list of strings. |
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17 |
5 |
18 import io.Source |
6 import io.Source |
19 import scala.util._ |
7 import scala.util._ |
20 |
8 |
21 def get_csv_page(url: String) : List[String] = |
9 def get_csv_page(url: String) : List[String] = |
56 |
44 |
57 def sorted_country_consumption() : List[(String, Long)] = { |
45 def sorted_country_consumption() : List[(String, Long)] = { |
58 val alcs2 = process_alcs(alcs.drop(1)) |
46 val alcs2 = process_alcs(alcs.drop(1)) |
59 val pops2 = process_pops(pops.drop(1)) |
47 val pops2 = process_pops(pops.drop(1)) |
60 val cons_list = |
48 val cons_list = |
61 for ((cname, cons) <- alcs2; if pops2.isDefinedAt(cname)) yield (cname, (cons * pops2(cname)).toLong) |
49 for ((cname, cons) <- alcs2; |
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50 if pops2.isDefinedAt(cname)) yield (cname, (cons * pops2(cname)).toLong) |
62 cons_list.sortBy(_._2).reverse |
51 cons_list.sortBy(_._2).reverse |
63 } |
52 } |
64 |
53 |
65 sorted_country_consumption().take(10) |
54 sorted_country_consumption()(9) |
66 sorted_country_consumption().size |
55 sorted_country_consumption().size |
67 |
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68 consumption.foreach { println } |
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69 |
56 |
70 def percentage(n: Int) : (Long, Long, Double) = { |
57 def percentage(n: Int) : (Long, Long, Double) = { |
71 val cons_list = sorted_country_consumption() |
58 val cons_list = sorted_country_consumption() |
72 val sum_n = cons_list.take(n).map(_._2).sum |
59 val sum_n = cons_list.take(n).map(_._2).sum |
73 val sum_all = cons_list.map(_._2).sum |
60 val sum_all = cons_list.map(_._2).sum |
74 val perc = (sum_n.toDouble / sum_all.toDouble) * 100.0 |
61 val perc = (sum_n.toDouble / sum_all.toDouble) * 100.0 |
75 (sum_all, sum_n, perc) |
62 (sum_all, sum_n, perc) |
76 } |
63 } |
77 |
64 |
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65 |
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66 percentage(10) |
78 percentage(164) |
67 percentage(164) |
79 |
68 |
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69 assert(percentage(164) == (28771558364L, 28771558364L, 100.0)) |
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70 |
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71 } |
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72 |