How to call the Callback function （in a subfunction of another Callback function）?

The following is my code:

function pushbutton1_Callback(hObject, eventdata, handles)
  body

function pushbutton2_Callback(hObject, eventdata, handles)
  subfun(hObject, eventdata, handles)  % sub(...) is a subfunction or a .m file

function subfun(hObject, eventdata, handles)
   pushbutton1_Callback(hObject, eventdata, handles) % call pushbutton1_Callback

It's strange that matlab show the error message:

Undefined function 'pushbutton1_Callback' for input arguments of type 'struct'. I want to know how to call the function 'pushbutton1_Callback()' in function 'subfun()'.Thanks

Answer 1

[Sean de Wolski]

You will have to pass the subfunction handles back from the main function:

%%%begin main.m%%%%
function [y, fh] = main(x)
y = pi*x;
fh = @subfun

function Q = subfun(a,b)
Q = a+b

%%%end main.m%%%

Now when you call main: you get the function handle back.

[y,fh] = main(2);
fh(1,2);

[Darshan Shah]

Can you explain this in detail. I am struggling to use this explanation. I am new to GUIDE and programming.

Answer 2

[Jan]

The error message means, that:

• either the function pushbutton1_Callback is not visible ftom subfun(), e.g. if the callback is a subfunction of an M-file, but subfun() is stored in another M-file.
• or you use a struct as first input, while the callback requires the handle of the button as 1st input:

pushbutton1_Callback(ButtonHandle, EventData, handles)

Here EventData could be the empty matrix, if the callback function can handle this.

Answer 3

[QiQin Zhan]

I think it may be the first error you've said.

If I have a experment.m file,the code is as follows

function test1
x = 1

function test2
y = 0

Then how can I call the function 'test1' and 'test2' in another .m file?

[Jan]

@Chan: Is this a comment? If so, does it concern my answer? If so, please post this as a comment to reduce the confusion level.

Only the first function of an M-file can be called from other M-files. So either include a wrapper, such that the 1st function forwards the call to different subfunctions, or save the functions to individual M-files.

[QiQin Zhan]

I think I've got exact answer from Sean.It's an excellent idea to use function handle to call the second function from other M-files.Anyhow I would thank you very much.