sym14.asv

电路与系统专业的matlab程序。有很多经典的实例。

%求卷积
syms t tao positive;		%把t定义为限定性符号变量 
xt=sym('3*Heaviside(t-2)');
ht=2*exp(-t);
yt=int(subs(xt,t,tao)*subs(ht,t,t-tao),tao,0,t)
yt1=collect(yt,'Heaviside(t-2)')  %合并
 ezplot(yt1,[-1,6])

xt=sym('3*Heaviside(t)')
ht=sym('3*Heaviside(t)')
yt=int(subs(xt,t,tao)*subs(ht,t,t-tao),tao,0,t)
xt=sym('exp(-t)*Heaviside(t)')
ht=sym('exp(-2*t)*Heaviside(t)')
yt=int(subs(xt,t,tao)*subs(ht,t,t-tao),tao,0,t)