![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1362193/image.png)
Using Switch/Case to assign values
7 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Poseidon
am 20 Apr. 2023
Kommentiert: Cris LaPierre
am 20 Apr. 2023
Hi
I am trying to use switch/case like below but when I run it, says eq is unrecognised variable or function. This is for an app.
switch app.SelectEvaporatorTypeDropDown.Value
case 'Forced Circlation (pumped)'
eq(1)=1;
case 'Falling Film'
eq(1)=2;
case 'Agitated Film (scraped wall)'
eq(1)=3;
case 'Short Tube'
eq(1)=4;
case 'Long Tube'
eq(1)=5
end
3 Kommentare
DGM
am 20 Apr. 2023
I don't see any way that the given code would ever produce that specific error. While eq() is a builtin function, and it's probably a bad idea to be naming your variables after functions, it's not apparent to me how that would be causing this specific error either.
Of course, you didn't include the entire error message backtrace, so it's not clear that this chunk of code is even part of the problem.
Fangjun Jiang
am 20 Apr. 2023
Although not recommended, your code does not have error here.
- "eq" is a function. use some other variable name, e.g. Myeq
- Before this code, pre-allocate the variable and value, Myeq=1;
app.SelectEvaporatorTypeDropDown.Value='Forced Circlation (pumped)';
switch app.SelectEvaporatorTypeDropDown.Value
case 'Forced Circlation (pumped)'
eq(1)=1
case 'Falling Film'
eq(1)=2;
case 'Agitated Film (scraped wall)'
eq(1)=3;
case 'Short Tube'
eq(1)=4;
case 'Long Tube'
eq(1)=5
end
Akzeptierte Antwort
Cris LaPierre
am 20 Apr. 2023
Bearbeitet: Cris LaPierre
am 20 Apr. 2023
I suspect the error is not occuring in the lines of code you have shared, but later on in another function when you try to use eq. Keep in mind variable scope. All your code in an app is inside functions. Once that function completes, its workspace is cleared.
If you want to share data between functions in your app, you must add the variable as a property of the app. See here: https://www.mathworks.com/help/matlab/creating_guis/share-data-across-callbacks-in-app-designer.html
You then access it by prepending with the property name with your app object name, like so: app.eq
4 Kommentare
Cris LaPierre
am 20 Apr. 2023
Just an additional note that you can also preallocate your property this way:
properties (Access = private)
Myeq = zeros(1,4); % Description
end
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Migrate GUIDE Apps finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!