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

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Subhiksha
Subhiksha 2013-9-13
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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回答（1 个）

Walter Roberson
Walter Roberson 2013-9-13
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.

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