Plots graph from simulink scope to App Designer for MATLAB R2019a

I have an error using evalin command to plot simulink scope in UI axes - app designer MATLAB R2019a. How to solve this?

Answer 1

[Pujitha Narra]

Hi Nur,

I am not sure what the error is, but you can look at a similar query here:

https://in.mathworks.com/matlabcentral/answers/463048-plot-simulink-scope-in-app-designer

Hope it helps!

[Nur Huda Mohd Amin]

Thank you. I have opened the link but did not solved my problem.

The code below I have generate in MATLAB R2009b and the graph display in GUI;

switch popupmenu1value
    case 'PLOT 1'
        simout = evalin('base','simout');
        axes(handles.VVaxes1)
        plot(simout.Time,simout.Data(:,1),'r','LineWidth',2)
        xlabel('')
        ylabel('Voltage[V]')

but, when I generate the code in 2019a the graph did not display and error in app designer. I have to use MATLAB R2019a for supporting Arduino Nano 3.0 board.

Actually, I have tried this code below but still did not display the graph and error in app designer;

 switch app.PLOTSOPTIONSDropDown.Value
    case 'LIVE PLOTS'
       out = evalin('base',Output);
       app.PLOTSOPTIONSDropDown.Value = 'LIVE PLOTS';
       app.UIAxes_1
       plot(app.UIAxes_1,evalin('base',out.Output.Time),evalin('base',out.Output.Data(:,1)),'c','LineWidth',2)

[Pujitha Narra]

Hey,

Can you provide the error message that you received?

[Nur Huda Mohd Amin]

I have attached .pdf for the error message. Hopefully you have the solution for my problems. Thank you.

[Pujitha Narra]

Hi again!

I don't think the problem is with the 'evalin' function. For some reason, the variable 'Output' is not recognized i.e it is not in the workspace you are working in. Can you make sure you have it in your workspace and check if the error persists? Also which block are you using for 'Output' in the model?

[Nur Huda Mohd Amin]

Refer to the attachment given. Thank you.

[saleh said bouhliga]

hi

Solution to your question see here

https://se.mathworks.com/matlabcentral/fileexchange/73613-interface-between-matlab-app-and-simulink?s_tid=answers_rc2-1_p4_Topic