def StudyByDataList(Data: Array[(VectorC, Complex)],
                      IterNum: Int = 150, ProgressFunc: (Int, Double) => Unit = { (i, e) => {} }): Unit = {

    for (j <- 0 until IterNum) {
      var err = 0.0
      for (i <- 0 until Data.length) {
        err += error(Data(i)._1, Data(i)._2).absSqr
        study(Data(i)._1, Data(i)._2)
      }
      ProgressFunc(j, math.sqrt(err))
    }
  }