中文说明：Matlab具有强大的函数绘图功能,但其图形目前只能存为图片形式,一定程度上限制了数据的交流。通过这段代码可转换成dxf格式，便于后续建模用。
English Description：
Function drawing function of Matlab is a powerful, but its graphics is only available for images, and to some extent limits the exchange of data. Through this code can be converted to DXF format for subsequent modeling.