I'd like to make several 'figure' window

I want to add two figure windows, but <figure 2> window doesn't show up.

<code>

%상태 방정식

%Dx1 = -x1 - x2 + u1 + u2

%Dx2 = 6.5*x1 + u1

%y1 = x1

%y2 = x2

t = 0:0.01:15;

A = [-1 -1;6.5 0];

B = [1 1;1 0];

C = [1 0;0 1];

D = [0 0;0 0];

sys = ss(A,B,C,D);

impulse(sys,t);

[y,t,x] = impulse(sys,t);

y1 = [1 0]*y(:,:,1)' + [1 0]*y(:,:,2)';

y2 = [0 1]*y(:,:,1)' + [0 1]*y(:,:,2)';

figure(1)

plot(t,sys)

xlabel('Time,(s)')

ylabel('y')

grid;

legend('y')

figure(2)

subplot(211);

plot(t, y1); grid

ylabel('y_1')

subplot(212);

plot(t, y2); grid

xlabel('t (sec)'); ylabel('y_2')

Answer 1

[Infinite_king]

Hi 가현,

The following expression 'plot(t,sys)' will result in an error since 'sys' is a dynamic system model, and the 'plot' function will not accept a model as input. The line 'plot(t,sys)' can be removed because the 'impulse' function plots the impulse response of 'sys'

t = 0:0.01:15;
A = [-1 -1;6.5 0];
B = [1 1;1 0];
C = [1 0;0 1];
D = [0 0;0 0];
sys = ss(A,B,C,D);
impulse(sys,t); % this syntax will plot the impulse response
[y,t,x] = impulse(sys,t); 
y1 = [1 0]*y(:,:,1)' + [1 0]*y(:,:,2)';
y2 = [0 1]*y(:,:,1)' + [0 1]*y(:,:,2)';
figure(1)
% plot(t,sys)
xlabel('Time,(s)')
ylabel('y')
grid;
legend('y')

figure(2)
subplot(211);
plot(t, y1); grid 
ylabel('y_1')
subplot(212); 
plot(t, y2); grid 
xlabel('t (sec)'); ylabel('y_2') 

For more information on 'impulse' function, refer the following MATLAB documentation - https://www.mathworks.com/help/ident/ref/dynamicsystem.impulse.html

[가현]

Thank you for your kind reply. This helped me solve my problem!