Code Error When Trying to Plot Scope to Matlab Graph

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Kassandra Krinke
Kassandra Krinke 2020-3-14
评论： Kassandra Krinke 2020-3-18
What would cause the code "plot(ScopeData.time,ScopeData.signals.values,'or')" to have an error and how to fix it. This is my code:
x0 = -1;
A = -2;
B = 1;
C = 1;
D = 0;
t = linspace(0,10);
u = 2 +3*sin(3*t);
[y,~]=lsim(A,B,C,D,u,t,x0);
plot(t,y);
hold on
plot(ScopeData.time,ScopeData.signals.values,'or');
xlabel('time(s)');
ylabel('x(t)');
legend('lsim','simulink','Location','northwest');
This is my Simulink
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Aghamarsh Varanasi
Aghamarsh Varanasi 2020-3-17
编辑：Aghamarsh Varanasi 2020-3-17
Hi Kassandra,
You are trying to plot ScopeData. ScopeData, which seems to be a structure, doesn't seem to be defined in the current scope. Could you please share your Simulink (.slx) file, pertaining to your model.

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Aghamarsh Varanasi
Aghamarsh Varanasi 2020-3-18
Hi Kassandra,
It seems that you want to plot the Simulink Scope Data in MATLAB. Data Import/Export from Simulink can be set using the Configuration Parameters dialogue box. You could open the dialogue box from Simulation > Model Configuration Parameters, or press Ctrl+E. In the Data Import/Export Tab, you can select the variable in which you want to export the Simulink data. By default, the data is exported into a variable named ‘out’.
Hence your matlab code would be,
x0 = -1;
A = -2;
B = 1;
C = 1;
D = 0;
t = linspace(0,10);
u = 2 +3*sin(3*t);
[y,~]=lsim(A,B,C,D,u,t,x0);
plot(t,y);
hold on
xlabel('time(s)');
ylabel('x(t)');
legend('lsim','simulink','Location','northwest');
%The output of simulink is stored in a variable 'out'
%Access Scope data from out variable
time = out.ScopeData.time;
signals = out.ScopeData.signals.values;
plot(time, signals, '*g');
Make sure that you simulate the Simulink model before running the MATLAB Code.
Hope this helps.

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