大地测量学中的高斯主题正反算在matlab上的实现，即将大地坐标和直角坐标相互转换的文件(Gaussian theme positive and negative code, transform the coordinates in the geodetic coordinate system to the Cartesian coordinate system)

压缩包内有两个函数，X2Elem的作用是将直角坐标转换为轨道根数，Elem2X作用是将轨道根数转换为直角坐标(There are two functions in the compression package, x2elem is used to convert the rectangular coordinates to the number of track elements, and elem2x is used to conv