Trouble: integrating Gui button with data sorting script.

First the mission : I had buildt a script that works in a sequence to read data from .txt file, separate it and then develop matricies for all of the data so that later i can further analyze it.

The sequence starts with "Phase = 1" and so far ends at "Phase = 4". Then i built a gui into this script with uicontrol that will help navigate the features through the data/plots later.

At this point the script works just the way i want it.

But when i introduce load data button with a callback function that will load data by changing the workspace variable "Phase" from NaN to 1. I change the variable but nothing happens. I am assuming this is the case because the if statement that starts the sequence is at the very beginning of the script where as the callback function is at the end.

The code looks like this for the callback function

line:785> function Loaddata(hObject,eventdata)
    
   assignin('base','Phase',1)
   disp("debug")
    
end

% I am trying to run this part of code

line:328>
if Phase == 1    
     
    for i = 1 : length(LOG) % Finds how many "logs" are present in data sample.
        if LOG(i) == LOG(1) 
        Length = Length+1;  
        end
    end 
    if i == length(Data)    % identifies that the full length of data has is known.
        Phase = Phase + 1;
    end
end

% if I run the script without relying on the button, it runs perfectly. Having some trouble figuring out the right approach at this point. 
% I know I am changing the workspace variables for sure, but it seems like it doesn't matter because in terms of order the script is passed line 328
% by the time I can call the button callback function.

% I appreiciate the help!

[Geoff Hayes]

Vadim - are you using GUIDE, App Designer, or programmatically creating your GUI? What is line 785? What is line 328? Are these lines in your GUI code? Please copy and paste the full callback function code so that we can see how it calls Loaddata (if that is what it is doing). You don't need to save data to the base workspace. If using GUIDE (for example) you could save data to the handles structure so that all callbacks have access to this data.

[Vadim Kachan]

Thanks for looking into this post, I'll make sure to state the process I am using in my future posts.

Answer 1

[Walter Roberson]

Have the beginning of your code call some functions to create the GUI and present the first GUI screen. Then have your code call waitfor() to wait for the user to fill out the GUI and press the appropriate buttons. At the end of the callback for the "go ahead" button, arrange to trigger the condition that your code is waiting for. When the callbacks have all returned, waitfor() will detect that the condition has succeeded and will proceed to run the code.

Loaddata_handle = uicontro(....);
    
Loaddata_handle.UserData = nan;
[...]
waitfor(loaddata_handle, 'UserData', 1);
%do your phase 1 processing.

function Loaddata(hObject,eventdata)
   set(hObject.UserData, 1)
   disp("debug")
end

[Vadim Kachan]

Walter, Thank you. This worked perfectly! waitfor() is exactly what I was looking for.

[Vadim Kachan]

Walter, i am having some trouble with 'set(hObject.UserData, 1)

Error using handle.handle/set

Invalid or deleted object.

Error in TEST>Loaddata (line 792)

set(hObject,UserData,1)

Error using TEST (line 319)

Error while evaluating UIControl Callback.

[Vadim Kachan]

set(hObject,'UserData',1) fixed it