MATLAB Answers

How can I use Textbox input from GUI in a separate script?

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Megan
Megan on 5 Dec 2019
Edited: Megan on 19 Feb 2020
I want to use the input of the textbox of my gui which i have created with guide, in a seperate Matlab script, not that was which creates callbacks.
So I want to save the input into a variable and then I want to work with this variable in my own matlab script (main).

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JESUS DAVID ARIZA ROYETH
JESUS DAVID ARIZA ROYETH on 5 Dec 2019
you don't have to put in the same script you just have to write the name of the file and the program will automatically call it where it is
Adam
Adam on 5 Dec 2019
You really should consider converting it to a function though rather than a script.
Adam Danz
Adam Danz on 5 Dec 2019
Megan's answer moved here as a comment
But my main has 600 line of code I can not put it in the same script

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Answers (2)

JESUS DAVID ARIZA ROYETH
JESUS DAVID ARIZA ROYETH on 5 Dec 2019
you can simply call the function at the end, without the extension .m and it must be in the same folder of the graphical interface files:
% --- Executes on button press in execute.
function execute_Callback(hObject, eventdata, handles)
% hObject handle to execute (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
minVelocity = str2double(get(handles.minVelocity, 'string'));
maxVelocity = str2double(get(handles.maxVelocity, 'string'));
main

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Megan
Megan on 5 Dec 2019
I tried what you said but it didnt work. it does not see minVelocity as the same variable of the GUI.

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Adam Danz
Adam Danz on 5 Dec 2019
Edited: Adam Danz on 6 Dec 2019
"I want to use the input of the textbox of my gui which i have created with guide, in a seperate Matlab script"
There are several ways to share data stored in a GUI with an external file. This method below involves saving the data from the callback function to the GUI figure and then extracting that data from the external function [background info].
function execute_Callback(hObject, eventdata, handles)
% hObject handle to execute (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
minVelocity = str2double(get(handles.minVelocity, 'string'));
maxVelocity = str2double(get(handles.maxVelocity, 'string'));
% Store the data in the "UserData" property of the GUI Figure
% This assumes that the hObject is a child of the GUI figure
data.minVelocity = minVelocity;
data.amxVelocity = maxVelocity;
hObject.Parent.UserData = data;
Before you can extract this data form the external function, you must give your GUI a meaningful tag so it can be found by the external function. You can set the "Tag" property of the GUI figure from within GUIDE or from within your startup function. The code below assumes you've assigned the tag MyUniqueGuiTag but you should repace that with a more meaningful name.
From the external function....
% Find the gui using your unique tag
guiHandle = findobj('Type','Figure','Tag','MyUniqueGuiTag');
% Get the stored UserData
data = guiHandle.UserData
This hasn't been tested (I don't have Matlab opened right now). If you have any questions or problems that you can't resolve please leave a comment below.

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Adam Danz
Adam Danz on 12 Dec 2019
Regarding your error, you're mixing up where the chunks of code should go.
Take a few minutes to understand what's going on with that code so it makes sense to you. That way you can implement it more easily.
This line below is used to extract the data from the GUI after it's already been saved. As my answer explains, that's called from the external function (or an function, really).
data = guiHandle.UserData;
The basic steps are
  1. Assign the tag to your GUI
  2. Assign the data to your GUI Figure using the 1st chunk of code from my answer.
  3. Use the 2nd chunk of code from my answer to extract the saved data from an external function.
Megan
Megan on 13 Dec 2019
Okay thank you i did it how you told me.
How can I now use the extracted data?
for example the minVelocity in an other matlab script but same project
Adam Danz
Adam Danz on 13 Dec 2019
Your main question asks how to extract a variable from a GUI into a separate script. The 2nd block of code in my answer does that. I'm not sure what you mean by "how can I use the extracted data?". Once it's extracted you can do anything you want with it.

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