hermite interpolation with descriptive parameter names

def hermiteInterpolation(x: Array[Double], y: Array[Double], y1: Array[Double], xx: Array[Double]): Array[Double] = {
  val yy = new Array[Double](xx.length)
  var i = 0
  while (i < yy.length) {
    yy(i) = hermiteInterpolation(x, y, y1, xx(i))
    i += 1
  }
  yy
}