You may follow these steps
- Open App Designer by typing appdesigner in command window and Select a Blank app
- Drag and drop the Drop Down menu from component library to design view
- In Component browser, change Items in drop-down section to None, MatFile1, MatFile2, MatFile3
- Go to Code view and add a callback by pressing '+' symbol in code browser and change component to Drop-Down
- 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
