How to reset the pop-up menu value in GUI?

Hi,

This is my pop-up coding.

function Domain_Callback(hObject, eventdata, handles)
contents = cellstr(get(hObject,'string'));
popchoice = contents{get(hObject,'value')};
if (strcmp(popchoice, 'Time Domain'))
    Domain_value = 2;
elseif (strcmp(popchoice, 'Frequency Domain'))
    Domain_value = 3;
elseif (strcmp(popchoice, '----'))
    Domain_value = 1;   
end
assignin('base', 'Domain_value', Domain_value);

And this is my reset button function

function Clear_button_Callback(hObject, eventdata, handles)
set(handles.Domain,'Value',1);

It partly works. In GUI if I press the reset button, the pop-up menu will show '----', but the value won't change.

So how can I reset the pop-up value to 1?

[Geoff Hayes]

Jomei - which value won't change? Do you mean the Domain_value in the base workspace? I doubt the Domain_Callback is being called when you do

set(handles.Domain,'Value',1);

[Jomei]

Hi,

I mean the Domain_value in the workspace doesn't change.

[Geoff Hayes]

Right, because calling

set(handles.Domain,'Value',1);

does not call the Domain_Callback where you set the Domain_value. Do you need this value in the base workspace? How is it used?

[Jomei]

I need Domain_value = 1 in workspace (however, the pop-up menu just shows '----' and the Domain_value is not 1 ).

Now I have 4 pup-up menu, each has their own loop, so if they doesn't be reset (value = 1 or whatever), the coding will go wrong if function.

[Geoff Hayes]

Jomei - but you do understand why the value is not being set in the workspace, correct? And do you really need it to be defined in the workspace? If so, why?

[Jomei]

Thanks for replying.

As you said, I don't need to define the value when I want to reset the programme. Thus I just using evalin().

Answer 1

[Rik]

If you need something in your base workspace to be updated when you change things in your GUI, you could consider a programmatic class-based GUI. The example in the how to create a GUI thread should be relatively easy to adapt to your needs.

This different design would also remove the need for assignin.

[Jomei]

It's really useful link. Thanks

Answer 2

[Jomei]

Hi,

I think I know how to solve it, just simply clear the workspase valye by using evalin().

[Rik]

You should really avoid that strategy. It is very prone to breaking in ways that are difficult to diagnose. You should really consider changing your setup to one of the ways described in the link I posted.