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YAPC::EU 2018 Glasgow Update!

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Ingy döt Net 2018-08-17 15:15:24 +01:00
parent 22f33d4004
commit 4e2d22a71d
1170 changed files with 15042 additions and 3047 deletions
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37
Task/Quaternion-type/Scala/quaternion-type-1.scala
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@ -1,36 +1,31 @@
case class Quaternion(re:Double =0.0, i:Double =0.0, j:Double =0.0, k:Double =0.0) {
lazy val im=(i, j, k)
private lazy val norm2=re*re + i*i + j*j + k*k
lazy val norm=math.sqrt(norm2)
case class Quaternion(re: Double = 0.0, i: Double = 0.0, j: Double = 0.0, k: Double = 0.0) {
lazy val im = (i, j, k)
private lazy val norm2 = re*re + i*i + j*j + k*k
lazy val norm = math.sqrt(norm2)
def negative=new Quaternion(-re, -i, -j, -k)
def conjugate=new Quaternion(re, -i, -j, -k)
def reciprocal=new Quaternion(re/norm2, -i/norm2, -j/norm2, -k/norm2)
def negative = Quaternion(-re, -i, -j, -k)
def conjugate = Quaternion(re, -i, -j, -k)
def reciprocal = Quaternion(re/norm2, -i/norm2, -j/norm2, -k/norm2)
def +(q:Quaternion)=new Quaternion(re+q.re, i+q.i, j+q.j, k+q.k)
def -(q:Quaternion)=new Quaternion(re-q.re, i-q.i, j-q.j, k-q.k)
def *(q:Quaternion)=new Quaternion(
def +(q: Quaternion) = Quaternion(re+q.re, i+q.i, j+q.j, k+q.k)
def -(q: Quaternion) = Quaternion(re-q.re, i-q.i, j-q.j, k-q.k)
def *(q: Quaternion) = Quaternion(
re*q.re - i*q.i - j*q.j - k*q.k,
re*q.i + i*q.re + j*q.k - k*q.j,
re*q.j - i*q.k + j*q.re + k*q.i,
re*q.k + i*q.j - j*q.i + k*q.re
)
def /(q:Quaternion)=this*q.reciprocal
def /(q: Quaternion) = this * q.reciprocal
def unary_- = negative
def unary_~ = conjugate
override def equals(x:Any):Boolean=x match {
case Quaternion(re, i, j, k) => (Double.doubleToLongBits(this.re)==Double.doubleToLongBits(re)) &&
Double.doubleToLongBits(this.i)==Double.doubleToLongBits(i) &&
Double.doubleToLongBits(this.j)==Double.doubleToLongBits(j) &&
Double.doubleToLongBits(this.k)==Double.doubleToLongBits(k)
case _ => false
}
override def toString()="Q(%.2f, %.2fi, %.2fj, %.2fk)".formatLocal(Locale.ENGLISH, re,i,j,k)
override def toString = "Q(%.2f, %.2fi, %.2fj, %.2fk)".formatLocal(java.util.Locale.ENGLISH, re, i, j, k)
}
object Quaternion {
implicit def number2Quaternion[T <% Number](n:T):Quaternion = apply(n.doubleValue)
import scala.language.implicitConversions
import Numeric.Implicits._
implicit def number2Quaternion[T:Numeric](n: T) = Quaternion(n.toDouble)
}