Change Variable Value in a Script through App Designer GUI

Hi, I have a GUI made with App Designer where depending on the option selected from a drop down menu, a particular script will run when a button called 'START' is pressed. I also have several 'Edit Field (Numeric)' where I would want to edit the value of a variable from the GUI. So my issue is how do I change the variable value that is assigned in the script through the GUI's Edit Field.

 function STARTButtonPushed(app, event)
            if (strcmp(app.SelectTechniqueDropDown.Value,'Option1') 
                run('script1.m')
            elseif (strcmp(app.SelectTechniqueDropDown.Value,'Option2') 
                run('script2.m')
            elseif (strcmp(app.SelectTechniqueDropDown.Value, 'Option3') 
                run('script3.m')
            end

[Dennis]

Is there a good reason that you are using scripts instead of functions?

[Nick M.]

Not really, would it be easier to do it with functions?

[Dennis]

Yes, you could pass the variable as function input.

[Nick M.]

Do you have a simple example code on how to do this between an external function and the app designer numeric fields?

[Dennis]

Create a simple app with 1 pushbutton and 1 numeric edit field.

The callback of the pushbutton should look like this:

        function ButtonPushed(app, event)
            MyFcn(app.EditField.Value)  %check the name of your EditField if you have more than 1
        end               

The function can look like this (needs to be on search path):

function MyFcn(MyValue)
disp(MyValue)
end

[Nick M.]

It works and thanks for all the help Dennis!!. Also by chance do you know how to allow a user to input a matrix into an edit field?

[Dennis]

Which size/format does the matrix have? It might be easier to import the matrix from a file.

[Nick M.]

Its either a 4x4 matrix in this form for example:

[1 0 0 0;
 0 1 0 0;
 0 0 1 0;
 0 0 0 1]

or a 4x1 matrix in this form for example:

[1;1;1;0]

[Stephen23]

"...how to allow a user to input a matrix into an edit field?"

Rather than using an edit field, it would be simpler to use a uitable:

https://www.mathworks.com/help/matlab/ref/uitable.html