Writing callback for a pushbutton

So I'm trying to calculate a sum to a custom N, which a user writes into a uicontrol/edit field, but I can't seem to get the callback right.

This is how I create the edit field:

handles.M1_8.up = uicontrol ('Style','edit',...
                  'String','n',...
                  'FontSize',10,...
                  'Position',[215 415 50 20]);

And this is the pushbutton:

handles.M1_8.calculate = uicontrol ('Style','pushbutton',...
                  'String','Calculate',...
                  'Position',[320 305 60 25],...
                  'Callback',@(~,~,handles) (calculate8_Callback(handles)));

And here's my function it's supposed to execute when pressing the Calculate button:

function calculate8_Callback(handles)
val = str2num(get(handles.M1_7.up,'String'));

Now, when I click the button, it says "Not enough input arguments." to the line where I wrote the callback to the pushbutton.

Any ideas why it's not working.

Answer 1

[Sean de Wolski]

The issue is in how you created the callback:

handles.M1_8.calculate = uicontrol ('Style','pushbutton',...
                'String','Calculate',...
                'Position',[320 305 60 25],...
                'Callback',@(~,~,handles) (calculate8_Callback(handles)));

The callback right now expects three inputs, ~,~,handles. However, is only gets two, the source and the eventdata. This should work as the calback:

@(~,~) (calculate8_Callback(handles)));

During the creation of the anonymous function, a snapshot of handles will be taken and then passed into calculate8_Callback.