Need Help with "could not evaluate maskdisplay commands of block"

Question

Ali Vali 2022-6-10

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评论： Vikram Kolupula 2023-1-14

Hi everyone,

I am doing the selfpaced "Simulink Fundamentals". I am doing the "Masking Subsystems" and I am getting this error message "could not evaluate maskdisplay commands of block".

According to the instructions, I have to enter the following code in the "Code" tab:

% Initialization code section
function initialization()
str1 = "Kp = " + Kp;
str2 = "Ki = " + Ki;
label = [str1;str2];
end
% Parameter callback section

In the "Icon" tab, I have been instructed to add "disp(label);". When I submit the solution, I get the following error:

"Does the following block have the correct parameter settings?

Susystem:

MaskDisplay: disp(label)"

When I go back to the "code" tab, I have warning with the "label". The warning says that "the value assigned to variable 'label' might be unused". I am not sure what it means.

Would you please help me to resolve the issue?

Thanks,

Ali

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Ali Vali 2022-6-11

Thank you walter. That line is not editable,

José Escobar Escobar 2022-12-27

Hello Ali, I have the same problem, did you find a solution?

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Answer 1

Prithvi Raj Pedapati 2022-7-18

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i too have the same issue in the beggining.... i figured out after several itrations. Try following this steps

reset the assignement given
the line of code is correctly given, try to use the same

str1="Kp=" +Kp; 
str2="Ki=" +Ki; 
label= [str1; str2]; 

3. In the display secction by default it shows

Disp ("gain")

remove "gain" and use the following code

Disp (lable) don't use " " as it is an array not a string.

This will work 100%, make sure no spell correction in the code and icon sections

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Vikram Kolupula 2023-1-14

Thank you, Prithvi Raj Pedapati

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Answer 2

Ramishetti sai sreeja 2022-6-13

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Hi Ali Vali,

It is my understanding that, while completing self-paced "Simulink Fundamentals", you got an error while updating the initialisations of display block in mask editor.

These are lines of code as you mentioned,

str1="Kp=" +Kp; 
str2="Ki=" +Ki; 
label= [str1; str2]; 

I executed the above lines of code, and the error is not reproducible at my end.

I assume the error might be due to the ‘end command’ at the end of the code which is to be removed.

If the error still persists, I recommend using the below lines of code:

str1=['Kp=' num2str(Kp)]; 
str2=['Ki=' num2str(Ki)]; 
label= char (str1, str2); 

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Ali Vali 2022-6-13

Simulink_Mask.png

HI there,

Thank you for your suggestion. I can not delete 'end' because its grayed out. I also you used your code and I got the save error. The error says "The value assigned to variable 'label' might be unused" do you know what this means?

Please check the attached screenshot.

Thanks,

Ali

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