Pass a value from callback function in GUI to an element of vector in Workspace !

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Jahandar Jahanipour 2016-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/284528-pass-a-value-from-callback-function-in-gui-to-an-element-of-vector-in-workspace

评论： Robert 2016-5-17

Hi. I have written a GUI without GUIDE. it first reads an image and some point from the main script and I want it to assign a value to each point.

in my gui, I iteratively ask the user to push two buttons based on the picture he sees. Pushing the button, I want a value (1 or 2) to be stored in my main (not GUI) workspace in the "label" vector.

I first tried to store all the values in one vector in GUI ("labelVector") workspace and then pass it to the base workspace: (for some reasons I had to define the i as a global variable)

 function falsePositive_Callback(hobject, ~, labelVector)
global i
labelVector(i)=1;
i=i+1;
end

the problem is that with this code everything is good before the end of the function. when the callback function ends, the value comes back to 0.

In the second attemps, in the callback function I used the function:

evalin('base','label(i)=1');

to instantly pass the variable that I want to the label vector in the 'base' workspace.

At this time, the problem is that only the first value changes to 1 and no matter how many iterations I push the button, only the first values changes.

can anyone address me through my problem? Thanks.

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Jahandar Jahanipour 2016-5-17

*assignin * can be used for a single variable. not a vector.

because I have my main code, in the middle, a gui will run and askthe user for the information(labels), it stores the information and the code will be continues based on the new information received from the user.