Your code:
function pushbutton1_Callback(hObject, eventdata, handles)
% nacitanie prvku
h=findobj(0,'Type','figure','Tag','figure1');
UserData=get(h,'UserData');
prvok=0;
if ((str2double(get(handles.pushbutton1,'string'))) == 1)
for i=1:UserData.pocet_vetiev;
prvok=prvok+1;
end
set(handles.text1, 'String',{prvok});
end
is auto-generated code from GUIDE that will be run every time the button is pushed. That's what the pushbutton callback function does. As such, you don't need to attempt to check if it is pushed, which is what I think you are trying to do here:
if ((str2double(get(handles.pushbutton1,'string'))) == 1)
the solution here is a one liner (two if you count the function identifier):
function pushbutton1_Callback(hObject, eventdata, handles)
set(h.text1,'string',num2str(str2double(get(h.text1,'string'))+1))
That's what Sean meant by use the engine part of his code.
