how to use function to output code to control GUIDE

In my GUIDE, user can adjust number and then the display item will change.

I have already wrote a code like this:

 for i=1:maxnumber
    k1=eval(['handles.TD',num2str(i),'X']);
    k2=eval(['handles.TD',num2str(i),'Y']);
    k3=eval(['handles.TD',num2str(i),'R']);
    k4=eval(['handles.TD',num2str(i),'AMP']);
    k5=eval(['handles.TD',num2str(i),'CD']);

    set(k1,'visible','on');
    set(k2,'visible','on');
    set(k3,'visible','on');
    set(k4,'visible','on');
    set(k5,'visible','on');
end

The key is last four "set" statement.

Now I want to write a function so I don't need to type this every time.

The code for function is the same as above.

But how can I use function to output "set" statement to control GUIDE?

Also, I found out I cannot use handles in function....is there a solution?

[Stephen23]

@herb: using eval is not a good way to achieve this, as the blogs, documentation, and this forum have explained multiple times before:

https://blogs.mathworks.com/loren/2005/12/13/use-dynamic-field-references/

https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

https://blogs.mathworks.com/videos/2010/03/08/top-10-matlab-code-practices-that-make-me-cry/

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

http://www.mathworks.com/matlabcentral/fileexchange/26216-structvars-varargin-

etc, etc

Answer 1

[Jan]

Of course you can use handles in a function - when you provide it as input argument.

Do not use eval to address a field of a struct. This is such ugly and evil. See https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval and hundrets of corresponding discussions in this forum.

function MySetFcn(maxnumber, handles)
for i=1:maxnumber
  H = [handles.(sprintf('TD%dX', i)), ...
       handles.(sprintf('TD%dY', i)), ...
       handles.(sprintf('TD%dR', i)), ...
       handles.(sprintf('TD%dAMP', i)), ...
       handles.(sprintf('TD%dCD', i))];

    set(H,'visible','on');
  end

Call this from your callbacks as:

MySetFcn(maxnumber, handles)
 The key is last four "set" statement.

The key for what?

 But how can I use function to output "set" statement to control GUIDE?

GUIDE is the tool to create a GUI. Do you want to control GUIDE or the GUI?

 Also, I found out I cannot use handles in function....is there a solution?

Please explain this claim. Show your code and the error message.

[Mahdie Rezaeian]

I have the same problem. What I want to do is plotting a column of an Excel file selected by the user from a popup menu. I've replicated the instructions in this video . the function for updating axes named "updateAxes". I tried calling this function in popup menu callback as follows:

set(handles.popupmenu1,'callback', '@(hObject,eventdata)mainGUI(''updateAxes'',hObject,eventdata,guidata(hObject))');

However, it's not working. how should I call updateAxes? I've attached the code and a sample excel sheet for your reference.

[herb]

"The key is last four "set" statement." means I can type this inside my GUI function to control visible or not. And because I will do this same thing many times, I want to write it into a function.

But I don't know how to write a function to output "set(handles.GUI,'visible','on')" to do the same thing.

I used GUIDE to create GUI, so what I want to control is the GUI.

[Jan]

@Mahdie: What about:

set(handles.popupmenu1,'callback', ...
   @(hObject,eventdata) updateAxes(hObject, eventdata, guidata(hObject)));

[Mahdie Rezaeian]

Hi Jan, Thanks for your reply. it works:) The other option is: set(handles.popupmenu1,'callback', 'mainGUI(''updateAxes'',gcbo,[],guidata(gcbo))')

Answer 2

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F