FunctionForecastLinear

Library "FunctionForecastLinear"
Method for linear Forecast, same as found in excel and other sheet packages.

forecast(sample_x, sample_y, target_x) linear forecast method.
  Parameters:
    sample_x: float array, sample data X value.
    sample_y: float array, sample data Y value.
    target_x: float, target X to get Y forecast value.
  Returns: float