breeze.plot.DomainFunction.scala Maven / Gradle / Ivy

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package breeze.plot

import breeze.linalg.QuasiTensor

/**
 * Represents a "function" T that knows its (finite) domain,
 * and can also be applied. Typeclass.
 * @author dlwh
 */
trait DomainFunction[T,K,+V] {
  def domain(t: T):IndexedSeq[K]
  def apply(t: T, k: K):V
}

object DomainFunction {
  implicit def arrIsDomainFunction[V]:DomainFunction[Array[V],Int,V] = {
    new DomainFunction[Array[V], Int, V] {
      def domain(t: Array[V]): IndexedSeq[Int] = 0 until t.length

      def apply(t: Array[V], k: Int): V = t(k)
    }
  }

  implicit def quasitensorIsDomainFunction[T,K,V](implicit ev: T<: