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

1 次查看（过去 30 天）

显示更早的评论

RZM 2018-9-7

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/417997-why-a-variable-randomly-is-not-updated-in-matlab-gui-using-guidata-function

关闭： MATLAB Answer Bot 2021-8-20

在 MATLAB Online 中打开

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);

3 个评论
显示 1更早的评论隐藏 1更早的评论

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.