1

I am just starting to learn about push buttons and i am stuck. I have two pop up menus. When the user selects the push button. the total from each pop up menu selection is returned to the user. I got the values from the pop up menu but I dont know how to return it after the push button is executed. Any help is appreciated

 function pushbutton1_Callback(hObject, eventdata, handles)

 math=0;

 data1 =get(handles.popupmenu1, 'Value')  %processing data from first pop up menu
 if data1== 1
 math=1
 elseif data1 == 2
    math=4
 end
 data2=get(handles.popupmenu2, 'Value')  %processing data from second pop up menu
 if data2==1
    math=math + 5;
 end
 % I tabulated math which is some number.  I want to return it back to the user 
 in  a text outside of the button.
Lucius II.
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Lindsay Baird
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2 Answers2

2

There is another way then returning the value: You pass and store it within the guidata-structure. Search for guidata in the docs for detailed information. One example from the docs:

function My_Callback()
% ...
% Get the structure using guidata in the local function
myhandles = guidata(gcbo);
% Modify the value of your counter
myhandles.numberOfErrors = myhandles.numberOfErrors + 1;
% Save the change you made to the structure
guidata(gcbo,myhandles)

Short explanation how to do it:

1. get the data by myhandles=guidata(handle_of_the_figure)

2. add/modify data, like myhandles.Test = 123

3. dont forget to save the changes, otherwise they will "just disappear"-> use guidata(handle_of_the_figure,myhandles)

4. to test it, just load the guidata afterwards within another function and look for the changes!

EDIT

while re-reading your question, it came to my mind, that you perhaps just want a value calculated within your callback to be displayed somewhere else. for example, if you want the value showing up in an text-edit uicontrol, you can use:

set(HandleOfTheTextEdit, 'String', num2str(mat))
Lucius II.
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1

A more elaborate, but more powerful way would be to create your own handle class.

Doing that you could add callbacks to custom data. I did an example here.

Community
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bdecaf
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  • +1 for showing something I didnt know befor. this is some next-level Matlab-programming :) will try next time, seems to be useful for larger sets of data(?) – Lucius II. Nov 08 '13 at 10:03