How to pass a variable to a function in GUI?

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?

[Adam]

You missed the line

guidata( hObject, handles )

from what you say you tried. Without this 'handles' is just a local copy of the struct in pushbutton1_Callback and goes out of scope when the function ends.

[Stephen23]

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]

Thank you both! After I posted this article, I did realize I missed

guidata(hObject, handles);

Thank you again!!!!!

Answer 1

[Adam]

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