Phase portrait in Matlab and simulink

Hello there,

I am working on modeling a system and showing its trajicotores using the phase plane portirate for various valuse of initial conditaons,

I had one problem with simout, I am exporting the variable x to the matlab workspace but still showing that it is unrecognized,

the second issue is that the following code is spposed to show the phase portirate but still not sure of the result because I cant get the variable x from simulink work space,

do I have to use different properties in the blcok sinks>to workspace, or just the default?

and is the following loop will show the required plot or won't?

I hope to get some ideas about it,

attached is the system model and the code

I have defined the required valuse for system stability a and b along with the initial conditios

clear all
clc
a=1;b=1;
Tfinal=15;
Time_inv=1;
ic=1;

for x0=-ic:.25:ic
x_dot0=-sqrt(ic^2-x0^2);
sim('SystemB');
figure(1)
plot(x,x_dot)
hold on;
figure(2)
polt(time,x)
hold one;
figure(3)
plot(time,x_dot)
hold on;
end

Answer 1

[Gashu Mesfin]

https://www.youtube.com/watch?v=n2l5FZ62n-k&t=29s