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Why a variable randomly is not updated in MATLAB GUI using guidata function?

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RZM
RZM 2018-9-7
关闭： MATLAB Answer Bot 2021-8-20
Hello, I have a problem in a GUI made using MATLAB Guide.
I have some timer functions which are executed sequentially. There is one variable (handles.UserData.C_cnt) which is shared between the timer functions. The variable is not updated after some random number of the execution of the timer function and I cannot figure out why this occurs. Could you check if the following structure I use for updating the variables inside a timer function is correct?
function timer_fcn(obj,event,hObject,eventdata)
handles = guidata(hObject);
handles.UserData.C_cnt = handles.UserData.C_cnt+1;
guidata(hObject, handles);
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RZM
RZM 2018-9-7
编辑：RZM 2018-9-7
I agree. Some experts recommend not to use global variables and they are evil so I tried to avoid them in GUI. But here when I use global variables it works fine so in this case I call them angels. :D I have also used eval function which is not recommended, maybe this random problem came from that but I had no other choice.

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