invalid expression error.
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B = 0.02;
a = 0.1;
f = 0.53;
phi = 3*pi/4;
t = -5:0.05:10;
x = B^a*exp (-a*t) .*sin(...2*pi*f*t+phi);
xu = x.*(t>O) ;
u = (t>0);
plot(t,x,t,u,t,xu)
ylabel('x (t)')
xlabel('t (s)')
text (O, 1.2, 'Tu(t)')
text (-4,-1.1,'x (t)')
axis ([t( 1)t(end)-1.5 1.5])
采纳的回答
B = 0.02;
a = 0.1;
f = 0.53;
phi = 3*pi/4;
t = -5:0.05:10;
x = B^a*exp (-a*t) .*sin(...
2*pi*f*t+phi);
xu = x.*(t>0) ;
u = (t>0);
plot(t,x,t,u,t,xu)
ylabel('x (t)')
xlabel('t (s)')
text (0, 1.2, 'Tu(t)')
text (-4,-1.1,'x (t)')
axis ([t(1) t(end) -1.5 1.5])
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