% 求下列函數的laplace變換
syms t s;
syms a b %對常數進行“限定性”設置				 	 
pause,Dt=sym('Dirac(t-a)')																	%<2>
pause,Ut=sym('Heaviside(t-b)')
pause,Rt=exp(-a*t)*sin(b*t)
pause,Yt=t^2*exp(-t)
pause,Mt=[Dt,Ut;Rt,Yt]
pause,MS=laplace(Mt,t,s)