data sharing between two GUI and with in a GUI

hi everyone, i am using a main GUI and a sub GUI and i created them using GUIDE. i want to pass variables from the main GUI to sub GUI and i made it using setappdata and getappdata. the code is as shown below:

setappdata(0,'sampfreq',fs);

i am able to transfer the "fs" value to the sub GUI but in the sub GUI when i am using handles to share the data with in the second GUI it is showing the error as shown below.

code:

set(handles.pp_val,'string',num2str(m));

i am using this command to display some value in the static text box.

the error i am getting is :

?? Attempt to reference field of non-structure array.

Error in ==> tr4>pbacquire_Callback at 87 set(handles.pp_val,'string',num2str(m));

can any one please suggest me to get rid of the above stated problem. please help me as i am struggling with this problem from last two weeks. please help me, thanks in advance.

Answer 1

[Fangjun Jiang]

Put a break point at this line and run your code, check what is the value of handles.pp_val, can you run the following command in the MATLAB command window:

get(handles.pp_val)

[Walter Roberson]

That particular error would occur if handles was not a structure at all, so checking with get(handles.pp_val) would fail. class(handles) would show you what type of thing handles is.

[Walter Roberson]

That particular error would occur if handles was not a structure at all, so checking with get(handles.pp_val) would fail. class(handles) would show you what type of thing handles is.

[phani]

thanks walter, i kept a break point at the command

set(handles.pp_val,'string',num2str(m));

and when i used class(handles) it displays

K>> class(handles)

ans =

double