How can I pass options from popupmenu to another callback function?

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Fa' 2012-7-20

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https://ww2.mathworks.cn/matlabcentral/answers/44123-how-can-i-pass-options-from-popupmenu-to-another-callback-function

Hi all! I'm programming a GUI. I have a popup menu that enables to display differents signals depending on the option selected. In the callback function of popup menu I've write this code:

% Determine the selected data set.  
str = get(source, 'String');
val = get(source,'Value');
% Set current data to the selected data set.
switch str{val}
case 'Delta' % User selects Delta.
  current_data = delta;
case 'Theta' % User selects Theta.
  current_data = theta;
case 'Alpha' % User selects Alpha.
  current_data = alpha;
case 'Beta' % User selects Beta.
  current_data = beta;
case 'Gamma' % User selects Gamma.
  current_data = gamma;
end

Now I've to pass the option selected to a pushbutton's callback function that generates plot when pushed by users. How can I do this? It would very helpful for me to resolve this problem. Thanks in advance.

[EDITED, code formatted, Jan]

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Jan 2012-7-20

编辑：Jan 2012-7-20

Please learn how to format the code properly. E.g. follow the "About MATLAB Answers" link. It is always a good idea to follow the standards of a forum.

I do not understand the question. What exactly is the problem?

Fa' 2012-7-20

在 MATLAB Online 中打开

I'm sorry, next time I shall pay attention. I'm new in this forum and I've to learn standards.

I would to pass the option selected in a popupmenu to a pushbutton's callback function where I've to use this options to plot different signals. This is the code I've write in the callback of the pushbutton (for the first option) but does not works:

handles.band = get(handles.popupmenuband,'String');
if val == 1
    axes(handles.axes2);
    handles.power = spt(:,2);
    plot(handles.assetempi,handles.power);
    xlabel('Time [s]');
    title('POWER');
end

Displays this line error

Undefined function or variable 'str'.

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Answer 1

Arthur 2012-7-20

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You don't need to pass the selected option when the selection is made in the popup. The easiest is simply read out the popup value when you run the callback of the button.

the callback of the button should look like this:

choise = get(handles.popupmenuband,'Value'); %get selected band
switch choise
     case 1
       % plot alpha
     case 2
       %plot beta
     case 3 
       %plot gamma
      %(etcetera)
  end