How do I solve the error: Undefined variable "handles" or class "handles.edit21"?

I have developed a GUI.When the pushbuttton is clicked, the calculation is done and the calculated number which is stored in the variable 'T' must be displayed in an edit box as the output. I have used

set(handles.edit21,'String',T);

in the pushbutton callback. However when i click the pushbutton, I get the following error:

Undefined variable "handles" or class "handles.edit21".

How can I rectify this?

Answer 1

[Muruganandham Subramanian]

Variable 'T' should be converted to string using num2str(T) first, before calling. Have you done this?

[Nitin Samuel]

yes i used

set(handles.edit21,'String',num2str(T));

still same error...

Answer 2

[Jan]

Whne the variable handles is unknown, you have to define it. This is actually trivial, so I'm not sure what the problem exactly is. A guess:

handles = guidata(hObject);

[Nitin Samuel]

Actually Im new to matlab so dont knw much...In the beginning you have :

handles = guihandles(fig);

guidata(fig, handles);

I tried adding in hObject with 'fig' & 'handles', it says

Undefined function or variable 'hObject'.

Where should I put it? Really appreciate your help..

Answer 3

[Ilham Hardy]

Did you use any clear -command family in your GUIDE code?

Such as:

clear
clearvars
clear all

[Nitin Samuel]

I havent.Should I? But how does adding that help?