How to pass a variable to a function in GUI?

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Salad Box
Salad Box 2018-2-26
评论： Salad Box 2018-2-26
Hi,
Please see the graphs shown below.
In part A (the part which will execute when button is pressed), you can see that I am trying to load a .mat file. There is a variable called 'RGB' saved in this .mat file.
And in part B, I am also trying to use the same variable RGB without loading it again.However, the RGB from part A would not be passed to part B just like that.
I also tried in part A I wrote:
handles.RGB=RGB;
and in part B I wrote:
RGB= handles.RGB
But it didn't work. Could anyone help please?
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Stephen23
Stephen23 2018-2-26
编辑：Stephen23 2018-2-26
Rather than using the command syntax of load it is recommended to use the function syntax, and load into an output variable (which is a structure). This will make it more obvious that the data has been loaded into that callback's workspace only:
S = load('Picture.mat');
handles.RGB = S.RGB;
guidata(hObject, handles) % you forgot this!
Salad Box
Salad Box 2018-2-26
Thank you both! After I posted this article, I did realize I missed
guidata(hObject, handles);
Thank you again!!!!!

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Adam
Adam 2018-2-26
https://uk.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html
Personally I use guidata if I am creating a GUIDE UI, but there are various different approaches in that link

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