Appdesigner load m-file with dropdown

I want to add an dropdown menu in the app designer.

with each option a stored m-file should be loaded. If possible the name should be there instead of option1/2/3. but I have no approach.

properties (Access = public)
        var1=load('1.mat'); % specify the path to mat file missing
        var2=load('2.mat');
        var3=load('3.mat');
        end

the rest unfortunately does not work

Answer 1

[Sai Sri Pathuri]

You may follow these steps

1. Open App Designer by typing appdesigner in command window and Select a Blank app
2. Drag and drop the Drop Down menu from component library to design view
3. In Component browser, change Items in drop-down section to None, MatFile1, MatFile2, MatFile3
4. Go to Code view and add a callback by pressing '+' symbol in code browser and change component to Drop-Down
5. Add this code in the new callback and save the app

    value = app.DropDown.Value;
    switch value
        case 'MatFile1'
            f = @(x) load(x, 'VarName1'); % VarName1 is the variable to be loaded from MatFile1
            out = f(value);
            assignin('base','VarName1',out.VarName1)
            
        case 'MatFile2'
            f = @(x) load(x, 'VarName2'); % VarName2 is the variable to be loaded from MatFile2
            out = f(value);
            assignin('base','VarName2',out.VarName2)
            
        case 'MatFile3'
            f = @(x) load(x, 'VarName3'); % VarName3 is the variable to be loaded from MatFile3
            out = f(value);
            assignin('base','VarName3',out.VarName3)
    end

If the variable name is same for all file, you may remove switch condition