lancegatlin

Alice's Adventures in Wonderland

                ALICE'S ADVENTURES IN WONDERLAND

                          Lewis Carroll

               THE MILLENNIUM FULCRUM EDITION 3.0

lancegatlin

// note: more efficient way to store matrix is a class that uses internal Buffer[Double] of size row * columns

//submatrix determination for calculating determinants of matrices
  def submatrix[A](i : Int, j : Int, matrix : Array[Array[A]]) = {

    //returns a new array of size n-1 with the ith index removed
    def remove[A](index : Int, arr: Seq[A]): Seq[A] = {
      // Note: removing the ith index from a sequence is considered highly inefficient and to be avoided whenever possible
      arr.take(index) ++ arr.drop(index+1)
    }

lancegatlin

import scala.io.Source

//read a file and build a concordance list of the tokens in the file
  //there's gotta be a nicer way to do this
  def two(fileName:String) = {
    val chunkSize = 1024
    Source.fromFile(fileName).getLines()
      // read in chunkSize lines into memory at once
      // From: http://stackoverflow.com/questions/6751463/iterate-over-lines-in-a-file-in-parallel-scala
      .grouped(chunkSize)

lancegatlin

object FutureOps extends FutureOps
trait FutureOps {
	def toTry[A](self: Future[A])(implicit ec: ExecutionContext): Future[Try[A]] = {
		val p = Promise[Try[A]]()
		self onComplete { case result => p.success(result) }
		p.future
	}
	def takeFirstMatch[A](futures: Traversable[Future[A]], predicate: A => Boolean)(implicit ec:ExecutionContext): Future[Option[A]] = {
		if(futures.nonEmpty) {
			val promise = Promise[Option[A]]()