how to make variables inside a timer function global?

hi.. i have used a timer that gets a frame from an axes(a webcam is live fed into the axes).

 t=timer('TimerFcn',['frame=get(get(handles.cameraAxes,''children''),''cdata'');'.....getting
        'stop(handles.video);','imshow(frame);'...dsf
   ],'StartDelay',5);

 start(t);

How to use the variable 'frame' in another function??.I have tried to update the handles, but it doesn't work.

Kindly help.

[Diogo Milagres]

Use global frame in all functions that need it.