中文说明：
MATLAB中的函数文件，用于计算多向层压板的层压板工程常数，该层压板由在主要材料方向上具有已知材料数据值、已知纤维方向和已知层压板坐标的层组成。
English Description：
The function file in MATLAB is used to calculate the laminate engineering constants of multidirectional laminates, which are composed of layers with known material data values, known fiber directions and known laminate coordinates in the main material directions