def -()

in algebird-core/src/main/scala/com/twitter/algebird/Approximate.scala [104:127]

• 16 lines of code
• 6 McCabe index (conditional complexity)

  def -(right: Approximate[N]): Approximate[N] =
    this.+(right.negate)

  /**
   * This is not distributive, because: a*(b+c) has two probability multiplications while (a*b + a*b) has
   * three Some kind of general formula solver could possibly make this distributive, but in the mean time,
   * it's only a group
   */
  def *(right: Approximate[N]): Approximate[N] =
    if (right.isZero || isOne) {
      right
    } else if (isZero || right.isOne) {
      this
    } else {
      val n = numeric
      val ends = for {
        leftv <- List(min, max)
        rightv <- List(right.min, right.max)
      } yield n.times(leftv, rightv)

      val newProb = probWithinBounds * right.probWithinBounds

      Approximate(ends.min, n.times(estimate, right.estimate), ends.max, newProb)
    }