Help!!! How to browse text file data to another function

Hi, I'd like to creat an GUI, and it works fine in browsing text file but I can't get the data in another function.

This is a pushbutton to select the file, and Unexcited_Sample_file is the file data (that is a 240 * 5 double matrix).

function Unexcited_Sample_button_Callback(hObject, eventdata, handles)

[Unexcited__Sample] = uigetfile ('*.txt');
Unexcited_Sample_file = load(Unexcited__Sample); % read (load) the file which is a 240 * 5 double matrix

assignin('base','Unexcited_Sample_file',Unexcited_Sample_file); 

However, I'd like to get Unexcited_Sample_file data in the function Plotting_button_Callback, it becomes 0.

Is that because I use wrong pointer?

function Plotting_button_Callback(hObject, eventdata, handles)
Unexcited_Sample_file = get(handles.Unexcited_Sample_button,'value'); % it becomes 0!!!

How can I improve this code?

Thanks

Answer 1

[Benjamin Großmann]

It seems that you access the value of the button, which is not what you intend to do. What you probably want to do is to share data among callbacks: https://de.mathworks.com/help/matlab/creating_guis/share-data-among-callbacks.html

In your two functions you could add something like

data = guidata(hObject);

to retrive the data and

guidata(hObject, data)

to store data. The guidata can only exist of a single variable, but this variable could be a struct which stores different data as fields.

You can add the following to the button callback to store the sample data

data = guidata(hObject);
data.Unexcited_Sample_file = Unexcited_Sample_file;
guidata(hObject, data)

And the following to the plotting function

data = guidata(hObject);
Unexcited_Sample_file = data.Unexcited_Sample_file;

Please also consider to initialize the struct variable (e.g. in gui opening fcn)

[Jomei]

It works, thanks alot!!!