what is wrong with this small app?

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Muazma Ali
Muazma Ali 2023-4-8
回答： Praveen Reddy 2023-4-10
Hi
I am trying to play around with my small list in this app but it seems matlab is not accepting my code.
Can anybody tell me whats wrong in it?
  2 个评论
Matt J
Matt J 2023-4-8
What would we need to do to observe the problem?
Muazma Ali
Muazma Ali 2023-4-10
hi @Matt J when I choose the first three elements from the list, the lamp is supposed to to turn to green. But I think I havent set up the criterion right in the app...
Could you check it , I would be very thankful. Actually I had programmed a list in my matlab program with result coming up as numbers and based on those numbers I had set up some conditions but when I started on the app, I had to use the list from the canvas then I could nt use the programmed once, :(

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回答（1 个）

Praveen Reddy
Praveen Reddy 2023-4-10
Hi Mauzama,
I understand that you want to make the lamp glow green whenever user selects the first three values from the “ListBox”. In the call back function I could observe that you are comparing “value” with string, but “value” is a cell array of all the selected items.
if (strcmpi(value, 'CaCl2') && strcmpi(value,'MgCl2') && strcmpi(value, 'NH4Cl'))
app.Lamp.Color='g';
else
app.Lamp.Color='r';
end
Modify the if condition in the call back function as below
% Value changed function: ListBox
function ListBoxValueChanged(app, event)
value = app.ListBox.Value;
if(any(ismember(value,'CaCl2')) && any(ismember(value,'MgCl2')) && any(ismember(value,'NH4Cl')))
app.Lamp.Color='g';
else
app.Lamp.Color='r';
end
end
To know more about “ismember” and “any” functions, please refer to the following MATLAB documentation
I hope the above information resolves your query.

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