How to Define a Checkbox?

Currently when I run through a code, which I have two checkboxes in, the second is undefined. I was given the original code to update and one of the updates that I made was adding another checkbox. (I made another checkbox using GUIDE.) I have almost an identical method for defining this checkbox, but it says that it is undefined. The results of the checkbox are used in an if statement that determines how the resulting document will be saved.

Checkbox #1 that works: values1 = get(handles.checkbox1,'Value'); if values1 open_system(test_model_name) else load_system(test_model_name) end

My Checkbox: values = get(handles.checkbox2, 'Value'); if values == 0 %...goes into the rest of my statement

Going through the entire code given, the first checkbox is not mentioned anywhere else. How is it defined and the second one not!?!?

[Jan]

What do you mean with "defining a checkbox"? You can create a checkbox in GUIDe or programmatically by the uicontrol command. You can create the field handles.checkbox2 and assign the handle to the checkbox. GUIDE uses the tag of the checkbox as field name. So maybe your 2nd checkbox does not have the tag "checkbox2"?

Please post the relevant part of the code, the .fig file and a copy of the complete error message.

[Lexington Stoyell]

Below I have attached, the figure, GUI "code" for the checkbox portion of the figure, how I have defined checkbox2 and the error given.

[Walter Roberson]

Your error message refers to a variable named 'checkbox2' that is not used in any of the code you posted.

The code image you posted attempts to get a property of handles.checkbox2_Callback which is not likely to exist and which would confuse people if it did exist. If you have an object with tag 'checkbox2' then you would get(handles.checkbox2, 'value')

[Lexington Stoyell]

Okay, yes I have changes the code to get properties from checkbox2.

     " vis1 = get(handles.checkbox2,'Value'); "

Previously I had used checkbox2_Callback in attempts to troubleshoot the issue. I still have the same error, even with this correction

[Adam]

If you create the checkbox in guide then it should create the callback for you, which will be correctly linked to the right checkbox. If you start editing the names of callbacks then things will go wrong.

The code snippet you posted is suspicious because the hint comments for the second one refer to 'checkbox1' rather than 'checkbox2' which suggests you have created it in some non-standard manner.

[Lexington Stoyell]

Thank you! I was given the GUI/Guide to edit and I added the checkbox (checkbox2)...do you have any suggestions how to possibly recreate so it will correctly link?

[Walter Roberson]

The error about undefined function or variable checkbox2 suggests that your code tries to do get(checkbox2, 'value') instead of get(handles.checkbox2, 'value') . But the information you are showing us is confusing because the code you show at one point uses h.checkbox2_Callback with structure name h instead of handles . We cannot debug problems if you are showing us different code than you are actually using.

[Lexington Stoyell]

Yes I understand Walter. I was saying that to debug had attempted to use "h.checkbox2_Callback" because that was how it was in the GUIDE code created (it is checkbox2_Callback). I am using the following line:

 vis1 = get(handles.checkbox2,'Value');

then an if statement using vis1 to do something different whether the checkbox has been checked or not.

[Walter Roberson]

Your description disagrees with your posted code https://www.mathworks.com/matlabcentral/answers/uploaded_files/103856/image.png which uses h instead of handles and uses values instead of vis1 . We therefore have reason to suspect that you have multiple code sections that disagree.

[Lexington Stoyell]

Once again yes Walter I understand, but I do not think that you are reading what I am writing. I AM NOT USING THIS. At the time I was attempt to debug the code, which failed. I am using what I had previously stated https://www.mathworks.com/matlabcentral/answers/381157-how-to-define-a-checkbox#comment_532837 and am using handles NOT h and vis1 NOT values. That is the only place that I have checkbox2 in my code.

[Walter Roberson]

That code cannot produce the error message given previously about undefined variable checkbox2 . At best it could have an error about Reference to non-existent field 'checkbox2'

We need your updated code and your current error message.

[Walter Roberson]

"Going through the entire code given, the first checkbox is not mentioned anywhere else. How is it defined"

It was defined in GUIDE. It lives in the .fig file when not in use, and loading the fig file recreates the graphics object. GUIDE called uicontrol() on your behalf when the GUI was constructed and saved the result in the .fig file.

Answer 1

[Jan]

The discussion in the comments gets more complicated that the actual problem is.

If you create a checkbox in GUIDE, the corresponding fields in the handles struct and the callback is created automatically. You can check this easily using the debugger and editing the code.

If your code fails, because a certain field in the handles struct is missing or contains unexpected values, this will be a mistake of the programmer. Then the debugger helps to identify, where the wrong value has been written to the handles struct.

Posting screenshots of the code is very inconvenient for the readers. Post the code as text or attach it instead. But it should not be hard to debug the code by your own.

My problem with helping you is the actual question, which I do not understand:

 Going through the entire code given, the first checkbox is not mentioned
 anywhere else. How is it defined and the second one not!?!?

What is missing where? Do you get an error message? Then please post it.

 Previously I had used checkbox2_Callback in attempts to troubleshoot the issue

This sounds like wild guessing. I know this state during programming. It is the perfect time to switch the monitor off and drink a cup of coffee. Some fresh air helps. Afterwards (preferably tomorrow) start the debugging again. It is very likely, that you find a tiny typo like "chekcbox2" or reveal a small wrong assumption.