Struct contents reference from a non-struct array object.

I need to make a function that showes me the state space model for a circuit and i need to overlap the simulink graph to the workspace one. I used this:

t=0:0.1:15;
u=(t>=0);
c=1;
L=1;
R=1;
x0=[0.59 1.71];
A=[0 1/c ; -1/L -R/L];
B=[0 ; 1/L];
C=[-1 -R];
D=[1];

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

[y,t,x]=lsim(sistem,u,t,x0);

figure;
plot(t,y); hold;
plot(ScopeData.time,ScopeData.signals.values,'x');

but for the last plot it said 'Struct contents reference from a non-struct array object.'

What's wrong?

[Stephen23]

Eugen Gamentzy' "Answer" moved here:

At first it worked, but when I came back to the program it said that error.

Answer 1

[Walter Roberson]

ScopeData is only created by the Simulink Scope Block https://www.mathworks.com/help/sldrt/ug/set-scope-parameters-for-logging-to-workspace.html or equivalent for Simulink Real Time. Apart from that ScopeData does not exist.

[Stephen23]

Eugen Gamentzy's "Answer" moved here:

I've made the Simulink ciruit as well, and logged the data from the scope as an array.

[Eugen Gamentzy]

I got it working, thank you very much mate :D

Answer 2

[Eugen Gamentzy]

I've made the Simulink ciruit as well, and logged the data from the scope as an array.

[Walter Roberson]

If ScopeData were initialized as the empty array and later expected to be overwritten with the struct but was not overwritten then you could get that error. You should look at size() and class() of the variable.