how to use a variable returned from one callback function in an other callback funtion in GUI??

Question

Subhiksha 2013-9-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/87103-how-to-use-a-variable-returned-from-one-callback-function-in-an-other-callback-funtion-in-gui

I have two functions called sum1_Callback and disp_Callback

function c=sum1_Callback(hObject, eventdata, handles) c= 2*2;

function disp_Callback(hObject, eventdata, handles,c) disp(c)

In sum_Callback, I have a variable c which I want to use in disp_Callback, but I get an error telling the variable is undefined.

What should be done??

Thanks in advance for the help.

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Answer 1

Walter Roberson 2013-9-13

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https://ww2.mathworks.cn/matlabcentral/answers/87103-how-to-use-a-variable-returned-from-one-callback-function-in-an-other-callback-funtion-in-gui#answer_96635

There are no callbacks that take eventdata as the second parameter and return values. The only callbacks that return values are the ones that are acting as filters, such as a constraint function programmed to ensure that a rectangle selection retains a particular proportion.