mgo.tools.distance.EuclideanDistance.scala Maven / Gradle / Ivy

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/*
 * Copyright (C) 13/11/13 Romain Reuillon
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package mgo.tools.distance

import scala.math._

trait EuclideanDistance <: Distance {
  def distance(p1: Seq[Double], p2: Seq[Double]): Double =
    sqrt((p1 zip p2).map {
      case (x, y) => pow(x - y, 2)
    }.sum)
}