Extrapolation problem

[Vlad-Karpov]

Hello Can you help me? I don't understand how to do that:

/**

• y = Q1 * x + Q0
• Q1=1/2
• Q0=1/6
• real data
• x 1 2 3
• y 4/6 7/6 10/6
• suppose Q1 and Q0 unknown
• and
• input data (random observe)
• x 1 2 3
• y 1 1/2 2
• need to find Q1 and Q0

• */ class LineEx {

  val Q1: Uniform = Uniform(-10.0, 10.0) val Q0: Uniform = Uniform(-10.0, 10.0)

  val e1 = Normal(fx(Q1, Q0, 1.0), 0.5) val e2 = Normal(fx(Q1, Q0, 2.0), 0.5) val e3 = Normal(fx(Q1, Q0, 3.0), 0.5)

  def fx(q1: Element[Double], q0: Element[Double], x: Double): Element[Double] = { q1 * Constant(x) ++ q0 }

  def resolve(): Array[Double] = { e1.observe(1.0) e2.observe(0.5) e3.observe(2.0) val likliHood = e1 e2 e3 val priorDistribution = Q1 Q0 val mg = MetropolisHastings(ProposalScheme.default, likliHood priorDistribution) mg.start() val r = Array( mg.computeExpectation(Q1, (d: Double) => { println(s"Q1=${d}") d }), mg.computeExpectation(Q0, (d: Double) => { println(s"Q0=${d}") d }) ) mg.stop() mg.kill() r }

}

this code doesn't work

thanks!