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def kellyFactor(pWin: Double, odd: Double) = { | |
(pWin * odd - 1) / (odd - 1) | |
} | |
def betSize( | |
bankroll: Double, | |
minOdd: Double, | |
odd: Double) = { | |
val pWin = 1.02 / minOdd | |
val kf = kellyFactor(pWin, odd) |
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trait Name { | |
def it: String | |
} | |
/** no need for explicit import */ | |
object Name { | |
implicit val criteo = new Name { val it = "asdf" } | |
} | |
object Live extends App { |
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class Type(type): | |
def __repr__(cls): | |
return cls.__name__ | |
class O(object, metaclass=Type): pass | |
class A(O): pass | |
class B(O): pass | |
class C(O): pass | |
class D(O): pass | |
class E(O): pass | |
class K1(A, B, C): pass |
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class Animal { def a = 1 } | |
trait Furry extends Animal { | |
override def a = 2 | |
} | |
trait HasLegs extends Animal { | |
override def a = super.a | |
} | |
trait FourLegged extends HasLegs | |
class Cat extends Animal with Furry with FourLegged |
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val rdd1 = sc.makeRDD(Seq((1,2),(1,2),(1,2),(1,2))).cache | |
rdd1.count | |
val rdd2 = rdd1.map(_._1 + 1).cache | |
rdd2.count | |
rdd1.unpersist() // rdd2 in storage | |
val df1 = Seq((1,2),(1,2),(1,2),(1,2)).toDF("key", "value").cache | |
df1.count | |
val df2 = df1.select('key, 'value + 1 as "inc").cache | |
df2.count |
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case class Product(id: Int, tags: Set[String]) | |
val productList = Array(Product(0, Set("a")), Product(1, Set("a", "b"))) | |
val tagDict1: Map[String, mutable.HashSet[Product]] = productList. | |
flatMap(p => p.tags.map(_ -> p)). | |
groupBy(_._1). | |
mapValues(v => mutable.HashSet() ++ v.map(_._2)) | |
val tagDict2 = Map[String, mutable.HashSet[Product]]( |
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import scala.io.Source | |
import java.io.PrintWriter | |
val command = "/tmp/cmd.sh" | |
val proc = Runtime.getRuntime.exec(Array(command)) | |
new Thread("stderr reader for " + command) { | |
override def run() { | |
for(line <- Source.fromInputStream(proc.getErrorStream).getLines) | |
System.err.println(line) | |
} |
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import java.nio.charset.StandardCharsets | |
def encode(s: String): Array[String] = { | |
StandardCharsets.UTF_8.encode(s).array.filter(_ != 0).map(b => "%08d".format((b & 0xFF).toBinaryString.toInt)) | |
} |
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class A { | |
def say() = println(this.hashCode()) | |
} | |
def fun(a: => A) = { | |
a.say() | |
a.say() | |
} | |
fun(new A) |
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