Creating GUI - problem with passing on values

Hello, I hope tilte of this question won't be mislead anyone.

I'm creating GUI, which uses some numerical data for further action. I have created several fields to input data:

function xxx_Callback(hObject, eventdata, handles)

xxx = str2double(get(hObject,'string'));

if isnan(xxx)

errordlg('You must enter a numeric value','Bad Input','modal')

uicontrol(hObject)

return

end

guidata(hObject,handles);

Let's assume there is 3 of them (xxx, yyy, zzz) built in the same manner. Additionally, I set up pushbutton, which should extract this values to 3 variables, and create matrix 1x3.

xxx= str2num(get(handles.xxx,'string')); yyy= str2num(get(handles.yyy,'string')); zzz= str2num(get(handles.zzz,'string'));

input = [xxx yyy zzz]; set(handles.xxx,'string',''); % resets edit set(handles.xxx,'string',''); % resets edit set(handles.xxx,'string',''); % resets edit guidata(hObject,handles);

Unfortunately, Matlab is not working as expected, it points me error that states:

"Error in ==> odczyt at 1 xxx = str2num(get(handles.xxx,'string'));

Error in ==> gui_temp>AAAA_method_Callback at 473 odczyt;

Error in ==> gui_mainfcn at 96 feval(varargin{:});

Error in ==> gui_temp at 42 gui_mainfcn(gui_State, varargin{:});

Error in ==> @(hObject,eventdata)gui_temp('AAAA_method_Callback',hObject,eventdata,guidata(hObject))

??? Error while evaluating uicontrol Callback"

Where "AAAA_method' is the name of this pushbutton.

Where is the problem in this code or idea? Thank you in advance for your ideas and comments.

Best regards, Marek

Answer 1

[Image Analyst]

I don't know why you call uicontrol() in the callback. What's the point of that? I think it will create a brand new control. As a matter of fact, that's probably why you're getting your error message. You've just blown away everything it knows about your control, including the callback function.

Do you want to just clear the edit field of whatever the user typed in? If so, use set(handles.xxx, 'String', []). And don't use "input" for your variable name - it's already a built in function and you'll destroy it by creating a variable of your own with the same name.

Answer 2

[Marek]

I am still beginner in using GUIDE, so I skipped calling uicontrol() as you suggested, but it did not change anything. What amazes me the most is the fact that when i call in Matlab console : xxx= str2num(get(handles.xxx,'string')); It works perfectly. I put this line in callback, not in pushbutton, but still there is no result. I checked some tutorials, but all I find is the same algorithms which works nicely.

[Image Analyst]

Is you max property more than 1 for the edit text box? If so, you might be returning a cell array instead of a string, and might have to use cell2mat instead of str2double.