Pass variable to .m file from app designer
18 views (last 30 days)
Show older comments
prabhjeet singh
on 1 Nov 2021
Edited: prabhjeet singh
on 22 Mar 2022
I am new in matlab app designer, but I have gone through basics of it. I have a very simple query where I am stuck at.
I am calling "backtest.m" file in app designer
%backtest.m file
clc;
clear;
close all;
z = x + 6;
And this is the app designer code
methods (Access = private)
% Button pushed function: Button
function ButtonPushed(app, event)
x = app.xEditField.Value;
backtest;
end
end
I get an error where x is undefined. What should I do to remove this error?
Thanks in advance.
Prabhjeet
3 Comments
Accepted Answer
Yongjian Feng
on 1 Nov 2021
Edited: Yongjian Feng
on 1 Nov 2021
Return z value from your funciton backtest.m:
function z = backtest(x)
z = x + 6;
end
Call this function from app designer like this:
z = backtest(x);
Basically you shall pass input/output to/from your function using input argument and return. Don't pass data using global variables.
6 Comments
Ayman Shaban
on 18 Mar 2022
Thank you very much for your answer, i have another Q , how can i show the result of .m file on app designer after already calling the .m file
More Answers (1)
Cris LaPierre
on 1 Nov 2021
This will never work as written. The clear inside the m-file, whether a script or function, will remove any variables, including the one passed in.
Remove the following from your m-file
clc;
clear;
close all;
Place the m-file in the same folder as your app. Now when you call it, it's the same as adding the code from your m-file to the code in the callback function.
Note that the variable z will only exist inside the callback function. You need to keep in mind your variable scope.
I do agree that turning this into a function makes more programatic sense to me, but it is not necessary to get it to work.
0 Comments
See Also
Categories
Find more on Develop Apps Using App Designer in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!