介绍MATLAB曲线拟合功能，并通过绘制弯矩图的实际例子说明它在有限元绘图中的应用-Introduction MATLAB curve fitting function, and moment diagram by drawing the actual examples of it in the drawing of the finite element

可以参考该绘图例子完成自己需要的绘图功能，可以裁剪其中代码(You can refer to the drawing example to complete their own drawing function, you can cut the code)