XYVariableData.scala

// We create a list of columns, that will contain all the variables to be filtred.
      val buffer = new scala.collection.mutable.ListBuffer[Array[_]]
      buffer += valueVariableX
      buffer += valueVariableY

      listFiltre.foreach { v ⇒ v
        val columnName = v.name.toString
        val columnVariable = getVariableFromColumn(columnName)
        val columnValue = get[Array[Double]](columnVariable) match {
          case Some(i: Array[Double]) ⇒ i
          case None ⇒ throw new UserBadDataError("column type not equal ")
        }
        buffer += columnValue
      }
      val buffer: List[Array[_]]= buffer.toList