简支梁受均布荷载为常数。试用MATLAB编程，

1）　　求剪力方程并绘出剪力图 ；

2）　　求弯矩方程并绘出弯矩图 ；

3）　　求转角方程并绘出转角图 ；

4）　　求挠度方程并绘出挠度图 ；

-The Charpy by uniformly distributed load is constant. Trial MATLAB programming, 1) and shear equation and draw the shear diagram　2) Find the moment equation and draw the bending moment diagram　3) Find the angular equation and draw the corner Figure　4) Find the deflection equation and draw the deflection diagram