Signal and system learning zero input response

System model sys With the help of tf Function to obtain , Invocation format ： sys = tf(b,a)
b Is the coefficient at the right end of the differential equation ; From higher order derivation To Low order derivative , commas
a Is the coefficient at the left end of the differential equation

%  Practice y"(t)+2y'(t)+77y(t) = f(t)  t>=0 when    Access incentives f(t) = 10sin(2Πt)   Find its zero state response 
a = [0 0 1];
b = [1 2 77];

sys = tf(a,b);% Notice here that the coefficient on the right side of the equal sign is in front 

t = 0:0.01:5;
f = 10.*sin(2*pi*t);
y1 = lsim(sys,f,t);
subplot(2, 1, 1);
plot(t,y1)

t = 0:0.01:5;
f = 10.*sin(2*pi*t);
y2 = lsim(sys,f,t);
sys = tf(b,a);
subplot(2, 1 ,2);
plot(t,y2)

xlabel('Time(sec)')
ylabel('y(t)')

I'm here to try how the coefficients on both sides of the equal sign of the differential equation can be written inversely
It was used subplot I want to compare , The discovery is the same ···

Study it later
Go to bed now ZZZ

········
Thinking from the next day
It should be the same ？
After all, both sides of the equal sign , It is equivalent to the problem of indifferent coefficient ？？
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（ By the way, roast again ,matlab Save the picture directly to the desktop , I can't upload it anymore ··· I gave the screenshot and it was easy to upload ····）