Histogram using TDigest

gistfile1.scala

import java.io.File
import java.nio.charset.Charset

import com.tdunning.math.stats.{ArrayDigest, TDigest}
import scala.collection.JavaConversions._ // needed for java Collection -> scala Seq
import scala.io.Source
import com.google.common.io.Files

object Histogram extends App {
  val distribution: TDigest = TDigest.createArrayDigest(35, 1000)
  val data: Iterator[Double] = Source.fromFile("rawdata").getLines().map(_.toDouble)
  data.foreach(point => distribution.add(point))
  val histogram = distribution.centroids().map(c => (c.mean, c. count())).map{case (c,v) => s"$c,$v\n"}
  val file = new File("histogram-from-tdigest")
  file.delete()
  file.createNewFile()
  histogram.foreach { row =>
    Files.append(row, file, Charset.defaultCharset())
  }
}