周期性差分自动平滑回归模型(SARIMA)的matlab代码，附有注释(英文)。包括模型阶数的选择和预测输出以及分析用图像和MAPE评价数值。(The code for matlab code for the periodic differential automatic smoothing regression model (SARIMA) with comments (in English). Including the choice of model order and forecast output and analysis of image and MAPE evaluation values.)