How do I create a call back function that updates a "Label" when I push a button? (Calculator)

Hello all, I am trying to impliment a GUI for my Calculator program. I have the GUI fully laid out and I am attempting to get my Label to update when I push a button. I am currently trying to get it to work by creating a call back for my button, lets call it Button_1, the button is supposed to set the value of the Label to 1. Any help would be much appriciated, I do not know where to start.

Answer 1

[Image Analyst]

Set the string property in the button callback:

function button1_Callback(hObject, eventdata, handles)
handles.Label.String = '1';   % Whatever

Answer 2

[Kevin Phung]

assign a tag to your label, which I assume is a text graphic object.

example:

txt1.Tag = 'label1';

function button_1callback(hObj,event)
label1= findobj(gcf,'Tag','label1');
label1.String = 'whateverValue';
end